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Science For Sleep. Deep Ocean_ What_s Hidden In The Abyss · Night Science Stories

• 0:00
  Speaker 1: Hi guys, welcome to Night Science Stories. Breathe in slowly
• 0:05
  Speaker 1: and let your shoulders drop. Tonight we will drift together
• 0:09
  Speaker 1: into the quietest darkness on our world. We will visit
• 0:13
  Speaker 1: the deep ocean, a place so gentle and so immense
• 0:17
  Speaker 1: that time itself seems to exhale there. Imagine the surface
• 0:23
  Speaker 1: at dusk. Waves turn from silver to a deeper blue,
• 0:27
  Speaker 1: and the last warm colour slides from the sky. We
• 0:30
  Speaker 1: leave behind the sound of wind and the clink of
• 0:34
  Speaker 1: rigging and begin to descend. The water at first is familiar.
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  Speaker 1: Sunlight still threads down in bright shafts, and you can
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  Speaker 1: see your hand and the gentle swirl of bubbles that
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  Speaker 1: follow you like tiny moons. Then the brightness thins. Reds
• 0:52
  Speaker 1: vanish first, then the oranges, then the yellows. All that
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  Speaker 1: remains is the cool blue that hangs on the longest,
• 1:01
  Speaker 1: and even that becomes a dim whisper. We enter what
• 1:05
  Speaker 1: oceanographers call the twilight zone, a band of water so
• 1:10
  Speaker 1: calm that a whisper would carry if sound could travel
• 1:13
  Speaker 1: that way. No sun reaches this band directly. Instead, you
• 1:19
  Speaker 1: are surrounded by a dreamlike glow from above, as if
• 1:23
  Speaker 1: a ceiling of frosted glass were filtering daylight into a
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  Speaker 1: thousand soft memories. Here, fish begin to change. Their bellies
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  Speaker 1: shine faintly with light of their own. Their backs are
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  Speaker 1: dark as ink. They do this to erase themselves, to
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  Speaker 1: match the faint sky above and the deeper night below.
• 1:45
  Speaker 1: Keep drifting. The twilight yields to true night. The sea
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  Speaker 1: turns velvet and the surface world disappears. Mapping this dark
• 1:55
  Speaker 1: vertical world is not simple. We think of the ocean
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  Speaker 1: as a blue plate on a map, but it is
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  Speaker 1: really a living mountain range of water. If we could
• 2:06
  Speaker 1: drain the seas for one slow hour, what would remain
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  Speaker 1: would be a world of cliffs, valleys, and plains large
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  Speaker 1: enough to cradle continents. The first step offshore is a
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  Speaker 1: broad shelf, a kind of terrace that once held forests
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  Speaker 1: and fields when sea levels were lower. Past the shelf,
• 2:27
  Speaker 1: the ground drops along the continental slope. a quiet escarpment
• 2:33
  Speaker 1: that falls into the great plains of the abyss. These plains,
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  Speaker 1: smoother than deserts, cover a great share of the planet
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  Speaker 1: and carry a rain of fine particles that fall for
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  Speaker 1: months before they finally rest. Across the plains rise long
• 2:50
  Speaker 1: chains of mountains, the mid-ocean ridges, where the crust of
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  Speaker 1: the earth opens and new rock is born. In other places,
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  Speaker 1: the crust bends and one plate slides gently beneath another.
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  Speaker 1: Their trenches appear, narrow and deep like ink strokes on
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  Speaker 1: the sea floor, valleys that reach farther down than the
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  Speaker 1: highest mountains, rise into the sky. When we say deep ocean,
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  Speaker 1: we mean not only a horizontal expanse, but a set
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  Speaker 1: of vertical neighbourhoods each with its own light, pressure, and
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  Speaker 1: rhythm of life. Pressure increases as we sink, not in
• 3:34
  Speaker 1: a hurry, but with unshakable patience. Near the surface, the
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  Speaker 1: weight is the weight of the air that lies above
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  Speaker 1: the sea. With each additional ten meters of water, the
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  Speaker 1: world adds the equivalent of another layer of air. Imagine
• 3:51
  Speaker 1: a quiet hand placing a book upon your palm every
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  Speaker 1: few steps downward, never stopping. Soon there is a library
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  Speaker 1: pressing upon you. The deeper you go, the more absolute
• 4:03
  Speaker 1: the hush becomes. Soft materials compress. Air vanishes from spaces
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  Speaker 1: that once held it. The hulls of deep diving machines
• 4:15
  Speaker 1: must be shaped like spheres or thick cylinders. because any
• 4:19
  Speaker 1: corners would crumble. For creatures that live here, this pressure
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  Speaker 1: is not an enemy. It is simply the weather of
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  Speaker 1: their world. Their tissues hold little to no compressible gas.
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  Speaker 1: Their bones, if they have bones at all, are thin
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  Speaker 1: and flexible. The marine snailfish that glides along trench walls
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  Speaker 1: is delicate and... translucent, a ghostly traveller adapted to pressures
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  Speaker 1: that would turn a human submarine into glittering confetti. Glycine
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  Speaker 1: and other small molecules in its cells help its proteins
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  Speaker 1: remain stable, so life's chemistry can continue even while gravity's
• 5:01
  Speaker 1: hand tightens. Pressure here is not a shout, it is
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  Speaker 1: a very slow embrace. Cold follows pressure as a companion.
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  Speaker 1: In the deep ocean, far from volcanic warm spots, the
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  Speaker 1: water rests just above the freezing point of salt water.
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  Speaker 1: Not ice cold, but the kind of cold that creeps
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  Speaker 1: into stone. This steady chill is not hostile. It is
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  Speaker 1: simply constant, like a metronome that keeps time for the
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  Speaker 1: planet's longest symphony. Life answers with its own patience. Many
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  Speaker 1: deep-sea animals move slowly, not from laziness, but from precision.
• 5:43
  Speaker 1: Their hearts beat with deliberate rhythm. Their stomachs digest food
• 5:48
  Speaker 1: over long spans of time. A faint warmth is made
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  Speaker 1: within them. Not much, only what is needed, as if
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  Speaker 1: their bodies were winter houses with heavy blankets and small
• 6:01
  Speaker 1: fires that never go out. There are exceptions. Around hydrothermal vents,
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  Speaker 1: places where seawater meets hot rock and returns rich with minerals,
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  Speaker 1: the cold is broken by breaths of heat. There the
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  Speaker 1: water can be warm enough to fog your imaginary lens,
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  Speaker 1: or even hot enough to boil if not for the
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  Speaker 1: weight that holds it liquid. But the general rule is
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  Speaker 1: gentle and clear. In the place where the world stores
• 6:32
  Speaker 1: its midnight, Temperature rarely surprises you. Out of this long
• 6:37
  Speaker 1: night rises a strange lantern festival. Many deep-sea creatures make
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  Speaker 1: their own light. The science is peaceful and elegant. Inside
• 6:47
  Speaker 1: their cells, or within small organs called light-bearers, lie chemicals
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  Speaker 1: that meet and glow. One is often called the light-bringer.
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  Speaker 1: Another is a helpful protein that guides the reaction. When
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  Speaker 1: they meet in the presence of oxygen and sometimes in
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  Speaker 1: the presence of a small helper that behaves like a
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  Speaker 1: calm assistant, there is a tiny release of energy as light.
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  Speaker 1: The colour is almost always blue-green, a shade that slips
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  Speaker 1: most easily through water. This glow is not just decoration,
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  Speaker 1: it is language. A comb jelly ripples with moving windows
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  Speaker 1: of light to startle a pursuer. A small fish hides
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  Speaker 1: its silhouette by shining with the exact brightness of the
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  Speaker 1: faint glow above, a moving counterfeit of empty water. A
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  Speaker 1: dragonfish carries a light on the end of a thin filament,
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  Speaker 1: and the light is food's favourite colour. In the deep
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  Speaker 1: red sea, some fish even carry filters that let them
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  Speaker 1: see and produce a dull red light, invisible to their neighbours.
• 8:02
  Speaker 1: a private beam in a public night. Many patterns are
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  Speaker 1: carefully timed. Some are bursts like sighs. Others are steady
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  Speaker 1: like a clock. If you watched in slow motion from
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  Speaker 1: a quiet perch, the dark would sparkle like a city
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  Speaker 1: seen from an airplane at night. Eyes in this darkness
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  Speaker 1: are miracles of design. Some animals choose to have very
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  Speaker 1: large eyes to gather any light that exists. The colossal
• 8:33
  Speaker 1: squid has eyes as wide as a dinner plate which
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  Speaker 1: can catch the pale shiver of a distant giant shadow.
• 8:42
  Speaker 1: Other creatures go the opposite way. They make themselves transparent
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  Speaker 1: so that light passes through them and no shadow gives
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  Speaker 1: them away. The barrel-eye fish has a clear shield over
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  Speaker 1: its head. and two tubular eyes that point upward, like
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  Speaker 1: twin telescopes focused on the dim world above. When food
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  Speaker 1: drifts by, the eyes can rotate forward to watch the
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  Speaker 1: mouth as it takes the meal. Shrimp and crabs carry
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  Speaker 1: mirrors made of crystals that focus light without lenses. Some
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  Speaker 1: squid are born with a skin that carries tiny tiles
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  Speaker 1: which can switch between colors or even reflect polarized light,
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  Speaker 1: the same kind of light that dances from the surface
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  Speaker 1: of a lake when you tilt your head. In this place,
• 9:34
  Speaker 1: vision does not only mean seeing with eyes. Some animals
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  Speaker 1: sense faint vibrations with long hairs. Others use electric fields.
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  Speaker 1: Many depend on smell that moves with currents in long
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  Speaker 1: feathered antennae. The night is full of senses we barely understand.
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  Speaker 1: The bodies that live here are tuned to a slow
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  Speaker 1: exchange of energy. Food is scarce, so waste is rare.
• 10:03
  Speaker 1: The giant isopod, a relative of the pillbug that lives
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  Speaker 1: under garden stones, can feast once and then wait for
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  Speaker 1: months without another bite. A Greenland shark from colder northern
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  Speaker 1: waters can live for longer than any other known vertebrate,
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  Speaker 1: perhaps for centuries, moving like a slow cloud. Deep sea
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  Speaker 1: corals build red and black skeletons, ring by ring, and
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  Speaker 1: some have been dated to more than 4,000 years, a
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  Speaker 1: patience written in mineral calligraphy. Many animals here are small
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  Speaker 1: but elegant. Others become large not from speed but from thrift.
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  Speaker 1: Gigantism in the deep sea is a kind of quiet
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  Speaker 1: success where a body grows big because there is no
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  Speaker 1: daily race and no sudden winter. Muscles are light and watery. Bones,
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  Speaker 1: if present, are thin. To us, this looks fragile. To them,
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  Speaker 1: this is wisdom. They carry only what they must. Food
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  Speaker 1: falls from above in a slow snowfall of tiny things.
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  Speaker 1: Marine snow is a poetic name that is also accurate.
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  Speaker 1: The particles are bits of plankton shells, fragments of plants
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  Speaker 1: and animals, a smudge of mucus here and there, and
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  Speaker 1: the products of digestion shaped into tiny pellets by creatures
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  Speaker 1: that graze in the lighted waters of the day. This
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  Speaker 1: snow drifts for weeks and months. On the way down,
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  Speaker 1: mid-water animals catch it. Bacteria soften it. Fatty bits grow
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  Speaker 1: fragrant and attractive to sniffing palates. On the bottom, the
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  Speaker 1: snow collects in hollows and along ripples where small worms
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  Speaker 1: and sea cucumbers sift it with mouths that never hurry.
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  Speaker 1: Sometimes a much larger meal arrives. A dead whale sinks,
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  Speaker 1: a continent of fat and bone that becomes an island
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  Speaker 1: of abundance. Hagfish braid into knots to pull at the flesh.
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  Speaker 1: Eels lift their heads like dark flags. White bacterial mats
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  Speaker 1: appear as if a fog had turned solid. Later, there
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  Speaker 1: is a stage where the bones themselves become homes, and
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  Speaker 1: yet later, the island fades and the desert returns. Although
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  Speaker 1: the deep seems still, water is always moving. There are
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  Speaker 1: currents we can name and others that are subtle. Cold,
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  Speaker 1: salty water forms near the poles and slides along the
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  Speaker 1: sea floor like a river of ice that never freezes.
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  Speaker 1: Warm surface water moves in broad gyres, driven by winds
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  Speaker 1: and the spin of the earth. Between these broad movements
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  Speaker 1: are narrow ones, Down welling carries water from the surface
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  Speaker 1: toward depth, sometimes right beside an underwater ridge. Up welling
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  Speaker 1: returns nutrient-rich water toward the light, and with it blooms
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  Speaker 1: of life appear at the surface like fields after rain.
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  Speaker 1: Within the deep, animals ride these rivers. Many undertake a
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  Speaker 1: daily migration. As night falls at the surface, small fish
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  Speaker 1: and plankton rise hundreds of meters to feed under the
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  Speaker 1: cover of darkness. With dawn, they return to the twilight
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  Speaker 1: and beyond. This is the largest animal commute on the planet,
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  Speaker 1: and it has gone on for ages. Imagine a vast
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  Speaker 1: elevator of life, rising and falling every 24 hours, powered
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  Speaker 1: by sunlight it never sees. We have spoken of plains
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  Speaker 1: and ridges, now picture cuts in the seafloor where the
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  Speaker 1: world folded upon itself. The great trenches are quiet corridors
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  Speaker 1: where gravity does its secret work. The Mariana, the Tonga
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  Speaker 1: and the Kuril trenches are well known, but beyond them
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  Speaker 1: lie many unnamed valleys. Pressure there reaches its greatest steadiness.
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  Speaker 1: The deepest points are very close to 11,000 metres, a
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  Speaker 1: figure that is simple to say and almost impossible to imagine.
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  Speaker 1: At such depths the water is heavy beyond intuition, yet
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  Speaker 1: life is present. A pale snailfish has been filmed deeper
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  Speaker 1: than 8,000 meters, fluttering with delicate fins like silk. Amphipods,
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  Speaker 1: which are small crustaceans, scuttle with cheerful speed despite the pressure.
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  Speaker 1: Bacteria and tiny archaea are everywhere, clinging to rocks and
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  Speaker 1: living in the pores of mud. These trenches are not isolated.
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  Speaker 1: They connect to the ocean's circulation. and to the geology
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  Speaker 1: of the planet. Minerals that settle there may eventually be
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  Speaker 1: drawn into the mantle of the earth and return as
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  Speaker 1: volcanic gases many thousands of years later. The trenches are
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  Speaker 1: part of a slow breath that joins water, rock, and air.
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  Speaker 1: Let us rest for a moment near a hydrothermal vent,
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  Speaker 1: a place where this slow breath becomes visible. Imagine a
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  Speaker 1: field of chimneys made not of brick but of minerals
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  Speaker 1: that precipitate out of hot fluid as it meets cold seawater.
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  Speaker 1: From their tops pours dark water, rich with metals and sulphur.
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  Speaker 1: The darkness is not dirt. It is a cloud of
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  Speaker 1: tiny particles that form when the hot solution meets the
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  Speaker 1: cold ocean. Around the chimneys are gardens of strange forms.
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  Speaker 1: Tube worms rear like organ pipes with bright red tips
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  Speaker 1: that are actually the blood-rich plumes through which they breathe.
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  Speaker 1: Mussels and clams cluster in heaps the size of cars.
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  Speaker 1: White crabs scuttle with lifted claws as if measuring the heat.
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  Speaker 1: These creatures are fed not by sunlight but by chemosynthesis,
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  Speaker 1: a process in which bacteria use chemical energy to fix carbon,
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  Speaker 1: building sugars from carbon dioxide and water using the energy
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  Speaker 1: stored in reducing agents such as hydrogen sulfide or methane.
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  Speaker 1: In simpler words, bacteria make food from stone breath and
• 16:39
  Speaker 1: larger animals host the bacteria in their tissues like friendly farms.
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  Speaker 1: When a vent shuts down, the garden fades. When a
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  Speaker 1: new vent opens nearby, a new city blooms. The entire
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  Speaker 1: neighbourhood can shift in a few years, which in this
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  Speaker 1: part of the ocean is the blink of an eye.
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  Speaker 1: There are other oases, where methane seeps from the seafloor,
• 17:05
  Speaker 1: mats of bacteria gleam like fallen clouds. Sometimes the seeps
• 17:10
  Speaker 1: form pools of brine, saltier than the sea around them,
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  Speaker 1: with edges that look like shores. A fish that swims
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  Speaker 1: into a brine pool does not return. It sinks as
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  Speaker 1: if through a window into heavy syrup. Yet on the
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  Speaker 1: rims of these pools live communities of worms and clams
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  Speaker 1: that thrive on the chemistry of methane and sulphate. Even
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  Speaker 1: on the wide plains of the abyss, starfish and soft
• 17:39
  Speaker 1: medusae drift near the bottom like lanterns. There is very
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  Speaker 1: little waste here. Skeletons and shells are recycled into new forms.
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  Speaker 1: The seafloor, we once called empty, is as intricate as
• 17:53
  Speaker 1: a night sky that at first seems black and then
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  Speaker 1: resolves into a thousand points. Sound travels far in water,
• 18:02
  Speaker 1: farther than light and farther than smell. In the deep ocean,
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  Speaker 1: you can hear glaciers groan and crumble as they carve
• 18:11
  Speaker 1: into the sea. You can hear the drumming of storms
• 18:14
  Speaker 1: from thousands of kilometers away, a deep rolling that arrives
• 18:19
  Speaker 1: long after the clouds have passed. The great whales sing
• 18:24
  Speaker 1: along lines in the water where temperature and depth permit
• 18:29
  Speaker 1: their voices to carry with minimal loss. Sperm whales click
• 18:34
  Speaker 1: with a sound like polished wood struck by a stick,
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  Speaker 1: bright and percussive, a language of measure and perhaps of dreams.
• 18:44
  Speaker 1: Shrimps snap in huge choruses in shallower waters and their
• 18:48
  Speaker 1: crackling blankets the background like rain upon leaves. If you
• 18:54
  Speaker 1: could translate this soundscape into a picture, it would be
• 18:58
  Speaker 1: a long landscape of hills and valleys, with rivers of
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  Speaker 1: quiet and mountains of noise. The deep is not silent,
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  Speaker 1: it is attentive. To explore this world we send machines
• 19:12
  Speaker 1: with careful hearts. Bathyscaphes, remotely operated vehicles, and free-falling landers
• 19:19
  Speaker 1: all make the journey down and up again. The safest
• 19:22
  Speaker 1: shapes are spheres and domes, because pressure loves to find corners.
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  Speaker 1: Cables unwind with patient grace. Cameras adjust to darkness with
• 19:33
  Speaker 1: slow eyes. Scientists paint their instruments white so that they
• 19:37
  Speaker 1: can be found again on the seafloor, and sometimes they
• 19:41
  Speaker 1: add a small timer that releases weights at an agreed-upon
• 19:45
  Speaker 1: hour so the instrument floats back to the surface like
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  Speaker 1: a seed. Even with this technology, most of the ocean
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  Speaker 1: remains unseen. The cost of time and distance is high,
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  Speaker 1: but the work continues because each visit reveals a new
• 20:03
  Speaker 1: note in the long song of the deep. A few
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  Speaker 1: brave humans have gone down as well, wrapped in thick
• 20:10
  Speaker 1: hulls with windows like crystal pearls. They speak of a
• 20:15
  Speaker 1: darkness that feels pure and friendly, a darkness that asks
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  Speaker 1: you to listen rather than to look. From far above
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  Speaker 1: the deep ocean seems disconnected from our lives, But it
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  Speaker 1: is not. The slow movement of cold water along the
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  Speaker 1: seafloor helps steer the climate of the surface. The deep
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  Speaker 1: is a warehouse for carbon, a place where the remains
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  Speaker 1: of plants and animals are hidden away from the air
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  Speaker 1: for long periods. When the small creatures of the surface
• 20:49
  Speaker 1: make their daily commute up and down, they move nutrients
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  Speaker 1: and carbon between layers. tying the ocean together like threads
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  Speaker 1: in a woven cloth. Even the largest storms are softened
• 21:03
  Speaker 1: by the ocean's ability to absorb heat. In that way,
• 21:07
  Speaker 1: the deep is a kind of buffer for the planet,
• 21:10
  Speaker 1: a cushion that turns sharp shocks into long, slow waves.
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  Speaker 1: The deep also keeps memories. Sediments on the seafloor hold
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  Speaker 1: thin layers like pages of a book. A layer rich
• 21:24
  Speaker 1: in ash tells of a far-away eruption. A layer heavy
• 21:28
  Speaker 1: in tiny shells tells of years when the surface bloomed.
• 21:33
  Speaker 1: The shells themselves, made of calcium carbonate, carry hints of
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  Speaker 1: the water in which they formed, including its temperature and
• 21:42
  Speaker 1: its chemistry. Scientists take slender cores from the seafloor and
• 21:48
  Speaker 1: read them slowly, page by page, a history Written without words,
• 21:54
  Speaker 1: ice cores do something similar in the polar regions. Together,
• 21:59
  Speaker 1: they show that the planet breathes on long timescales, that
• 22:03
  Speaker 1: currents rearrange themselves like furniture in a quiet house, and
• 22:09
  Speaker 1: that life adapts with patience. Humans leave marks here as well,
• 22:15
  Speaker 1: even without touching the bottom. Tiny fragments of plastic drift
• 22:20
  Speaker 1: downward in slow confusion. They settle into the mud and
• 22:24
  Speaker 1: become part of the modern layer. Lost fishing gear finds
• 22:29
  Speaker 1: its way down and tangles against outcrops. The good news
• 22:34
  Speaker 1: is that the deep is resilient when given time. Where
• 22:37
  Speaker 1: waste is removed, animals return. Where traffic slows, larvae find
• 22:43
  Speaker 1: places to land. The single best gift we offer the
• 22:47
  Speaker 1: deep is rest. It helps to remember that the ocean
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  Speaker 1: did not begin as an alien realm. It was the
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  Speaker 1: first home of life. Long before the first forests breathed
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  Speaker 1: the air, microbes learned to gather energy in the sea.
• 23:04
  Speaker 1: Over time, they invented pigments that could take in sunlight
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  Speaker 1: and turn it into sugar. That sugar fed larger bodies
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  Speaker 1: that crept, swam, and finally walked. The deep in this
• 23:16
  Speaker 1: story is an elder relative who never left the old home.
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  Speaker 1: Visiting it is a kind of return. The patience that
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  Speaker 1: rules there is the same patience that once ruled the
• 23:30
  Speaker 1: entire planet. Return now to the image of your descent.
• 23:35
  Speaker 1: You are in the quiet water beyond the reach of
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  Speaker 1: the sun. You can see the faint sparks of animals
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  Speaker 1: signalling to one another small greetings written in blue. You
• 23:47
  Speaker 1: can feel the softness of the current as it slides
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  Speaker 1: past you like silk. You know that somewhere far above
• 23:55
  Speaker 1: a storm is scratching at the surface, but here the
• 23:59
  Speaker 1: storm is only a distant rumour. Below you are valleys
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  Speaker 1: as deep as thought. In those valleys are gardens that
• 24:08
  Speaker 1: never see day, gardens fed by rock and chemical breath.
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  Speaker 1: Along the plains run travellers whose bodies are made of
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  Speaker 1: light and jelly and patience. The deep is no longer
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  Speaker 1: a blank. It is a city with a million windows,
• 24:24
  Speaker 1: and every window opens on a small and necessary life.
• 24:29
  Speaker 1: We have visited only a fraction of what can be said.
• 24:34
  Speaker 1: and already the calm has grown thicker than water. Perhaps
• 24:38
  Speaker 1: you are thinking of bioluminescent signatures as whispers exchanged behind
• 24:44
  Speaker 1: cupped hands. Perhaps you are picturing a vent field like
• 24:47
  Speaker 1: a city in winter, with white plumes rising like smoke
• 24:51
  Speaker 1: and crabs crossing the streets. Perhaps you are hearing a
• 24:55
  Speaker 1: whale song stretched across the ocean like a ribbon. All
• 24:59
  Speaker 1: of these are true in their own way. The deep
• 25:03
  Speaker 1: ocean is a library with many rooms, a cathedral with
• 25:08
  Speaker 1: many chapels, and a night sky with too many stars
• 25:13
  Speaker 1: to count. Let us rise a little, just enough to
• 25:17
  Speaker 1: see the twilight again. The blue glow returns, as if
• 25:21
  Speaker 1: a page were being read from beneath. A few jelly
• 25:25
  Speaker 1: forms drift upward with us, and small fish fold their
• 25:29
  Speaker 1: lights away as they approach the paler layer. The water
• 25:33
  Speaker 1: warms by a degree or two. Pressure eases. The world
• 25:38
  Speaker 1: brightens by shades and steps. In the distance, the surface
• 25:43
  Speaker 1: is a mirror with a sky written upon it. We
• 25:46
  Speaker 1: break through very gently. A breeze combs the waves. The
• 25:51
  Speaker 1: taste of salt is soft. and the coasts of the
• 25:54
  Speaker 1: continents are asleep, not knowing that beneath them stretches a
• 25:58
  Speaker 1: country vast and peaceful, full of slow dances and whispered light.
• 26:04
  Speaker 1: If you rest now, the ocean will keep watch. Its
• 26:08
  Speaker 1: night is endless, but not empty. It holds the deepest
• 26:12
  Speaker 1: quiet on earth, not because it lacks life, but because
• 26:16
  Speaker 1: life there has learned a slower music. And that music,
• 26:21
  Speaker 1: when you listen, sounds a lot like breathing. The water
• 26:25
  Speaker 1: around us grows still and heavy, as a theatre about
• 26:30
  Speaker 1: to lift its curtain. Ahead, along a dark ridge where
• 26:33
  Speaker 1: the crust of the earth opens to the sea, the
• 26:37
  Speaker 1: sea floor suddenly breathes. What appears first is a ghostly shimmer,
• 26:43
  Speaker 1: as if the water itself had become glass warmed by
• 26:46
  Speaker 1: an unseen fire. Then the chimneys appear. They are not
• 26:51
  Speaker 1: made by hands. They rise by quiet chemistry. Superheated water,
• 26:56
  Speaker 1: rich in minerals, surges up through cracks in the rock
• 27:00
  Speaker 1: and meets the cold, deep ocean. The shock is immediate.
• 27:05
  Speaker 1: Metals and sulphur fall out together as tiny grains and
• 27:10
  Speaker 1: build fragile stacks. From their mouths pour black plumes that
• 27:15
  Speaker 1: look like smoke from chimneys on a winter morning. Because
• 27:19
  Speaker 1: of this colour, explorers named them black smokers. The plumes
• 27:25
  Speaker 1: are not soot. They are clouds of mineral dust so
• 27:29
  Speaker 1: fine that they hang in the water for a long
• 27:32
  Speaker 1: time before settling like the gentlest ash. Around these chimneys,
• 27:38
  Speaker 1: life gathers as if... Answering a bell, large red-tipped tube
• 27:43
  Speaker 1: worms stand in groves like organ pipes. The bright tips
• 27:47
  Speaker 1: are not flowers, they are blood-rich plumes used for breathing.
• 27:52
  Speaker 1: The worms have no mouths and no stomachs. Inside their
• 27:57
  Speaker 1: bodies lives a populace of bacteria that feed them. The
• 28:01
  Speaker 1: bacteria take the energy of chemical reactions and use it
• 28:05
  Speaker 1: to build sugars from carbon dioxide, just as green plants
• 28:10
  Speaker 1: use sunlight. The host feeds the guests with sulphur-rich fluids
• 28:14
  Speaker 1: drawn from the vent water. The guests pay the rent
• 28:18
  Speaker 1: with food. There are mussels, clams, blind crabs and white
• 28:22
  Speaker 1: shrimp that swarm and then retreat in a sparkling cloud.
• 28:27
  Speaker 1: Fish with pale skin ghost by. The water itself is
• 28:32
  Speaker 1: hot enough to sting, but only a few finger-widths away
• 28:36
  Speaker 1: it is cold again. This knife edge between cold and
• 28:40
  Speaker 1: heat marks the border of an entire city made from
• 28:44
  Speaker 1: stone breath. When these vents were first seen by cameras
• 28:48
  Speaker 1: in the late 1970s near the Galapagos region, scientists had
• 28:53
  Speaker 1: expected bare rock and a faint drizzle of dead plankton. Instead,
• 28:59
  Speaker 1: they found more biomass than in many sunlit areas above.
• 29:03
  Speaker 1: It was as if night had produced its own day.
• 29:07
  Speaker 1: The lesson of the vents is simple and deep. Life
• 29:11
  Speaker 1: is not married to sunlight. It is married to energy
• 29:15
  Speaker 1: and to the means of building the molecules of self.
• 29:20
  Speaker 1: Where the planet lets minerals meet water and exchange electrons,
• 29:25
  Speaker 1: oxygen poor though the place may be, life sets the table.
• 29:30
  Speaker 1: Even the black plumes themselves are useful. As the fine
• 29:34
  Speaker 1: particles drift and settle, they form layers of metal-rich sediments that,
• 29:40
  Speaker 1: in the slow future, may become ores within mountains long
• 29:44
  Speaker 1: after the ocean floor has slid beneath a continent. A
• 29:49
  Speaker 1: vent field is a moment in a very long story.
• 29:53
  Speaker 1: Not all oases glow with heat. On many continental slopes,
• 29:58
  Speaker 1: methane seeps rise in gentle streams. The gas comes from
• 30:03
  Speaker 1: buried pockets within the sediment, or from chemical changes deeper
• 30:08
  Speaker 1: in the crust. When this methane meets cold seawater under pressure,
• 30:13
  Speaker 1: it sometimes forms crystals that look like frost. They are
• 30:18
  Speaker 1: called hydrates and they trap gas within a cage of
• 30:22
  Speaker 1: water molecules. On deck, a block of hydrate looks like
• 30:26
  Speaker 1: ice that can burn with a blue flame. Down in
• 30:31
  Speaker 1: the deep, hydrates resemble snowdrifts along the base of ridges.
• 30:35
  Speaker 1: Around the seeps, bacteria harvest the energy of methane and
• 30:40
  Speaker 1: of the reaction between methane and sulphate in the water.
• 30:44
  Speaker 1: They knit together mats as pale as skimmed milk. Clams
• 30:49
  Speaker 1: and mussels live on top, farmed by the microbes inside
• 30:53
  Speaker 1: their gills. Long-lived tube worms anchor to carbonate crusts that
• 30:59
  Speaker 1: form where seep fluids alter the chemistry of the sediment.
• 31:03
  Speaker 1: Some of these worms can live for centuries, growing only
• 31:08
  Speaker 1: the width of a fingernail each year. Cities of worms
• 31:12
  Speaker 1: is not a metaphor. They are cities built from patience.
• 31:18
  Speaker 1: Walk your eyes from these oases to the open water.
• 31:22
  Speaker 1: It is filled with builders that work in glass. Radiolarians
• 31:27
  Speaker 1: and diatoms fashion their skeletons from silica pulled from seawater.
• 31:32
  Speaker 1: The designs are elegant beyond jewelry. Radiolarians arrange spines and
• 31:39
  Speaker 1: cages in lattices that look grown from snowflakes and cathedral windows.
• 31:44
  Speaker 1: Each form is an answer to a simple problem. How
• 31:48
  Speaker 1: to make a light body that will not sink too fast,
• 31:52
  Speaker 1: that will catch food, that will survive long enough to divide.
• 31:56
  Speaker 1: Diatoms make shell halves that fit together like a box
• 32:00
  Speaker 1: and its lid. Some are shaped like needles, others like discs,
• 32:06
  Speaker 1: others like boats with ribs. When they die, their tiny
• 32:10
  Speaker 1: houses fall. Over long spans of time, the seafloor thickens
• 32:15
  Speaker 1: with white and tan layers called radiolarian ooze and diatom ooze.
• 32:21
  Speaker 1: A handful of this sediment is a museum. Diatom shells
• 32:26
  Speaker 1: from ancient seas have been lifted into the dry world
• 32:30
  Speaker 1: and ground to make a soft abrasive used to filter
• 32:34
  Speaker 1: and to polish. If you have ever cleaned water through
• 32:38
  Speaker 1: a powder that looks like flour, You may have used
• 32:42
  Speaker 1: the remains of a billion diatoms. Among the pebbles of
• 32:47
  Speaker 1: this glass world move bodies that seem oversized for so
• 32:52
  Speaker 1: spare a place. The deep sea likes its giants, though
• 32:56
  Speaker 1: the reasons are a mix of gentle ideas rather than
• 33:00
  Speaker 1: a single law. Low temperatures slow the machinery of cells.
• 33:05
  Speaker 1: Slow machines waste little. Predators are fewer and hunting is
• 33:10
  Speaker 1: rare and careful. Some lineages have had time to drift
• 33:15
  Speaker 1: toward large forms without penalty. The result is quiet spectacle.
• 33:20
  Speaker 1: Giant isopods walk like armoured shoes and hold their meal
• 33:25
  Speaker 1: for months. Giant amphipods, the shape of prawns but thick
• 33:29
  Speaker 1: as a wrist, drift within arcs of their own legs.
• 33:33
  Speaker 1: Squids in the deep can grow longer than stories told
• 33:37
  Speaker 1: by sailors, and the colossal squid carries eyes so large
• 33:42
  Speaker 1: that they can detect the pale signature of whales at
• 33:46
  Speaker 1: long distance. Even fish that remain small are part of
• 33:50
  Speaker 1: this logic. Their bones are thin and light, their bodies
• 33:55
  Speaker 1: are often gelatinous, a kindness that pressure cannot crush. To
• 34:01
  Speaker 1: live in the deep is to spend slowly and to
• 34:06
  Speaker 1: save carefully. Size is one more way to invest. The
• 34:11
  Speaker 1: water column itself forms bodies that are collectives. Siphonophores are
• 34:16
  Speaker 1: perhaps the most surprising of all. Each one begins as
• 34:20
  Speaker 1: a single fertilized egg, yet the adult is an entire
• 34:25
  Speaker 1: fleet of specialized units joined in a thread that can
• 34:29
  Speaker 1: stretch beyond the length of the largest whale. One unit
• 34:34
  Speaker 1: becomes a float that keeps the body at the chosen level.
• 34:38
  Speaker 1: Others become paddles that row steadily. Others become feeding bells.
• 34:45
  Speaker 1: Others still become stinging soldiers that defend the convoy. Every
• 34:49
  Speaker 1: unit shares nutrients through a common inner canal. To call
• 34:54
  Speaker 1: such a creature an individual is both true and insufficient.
• 34:59
  Speaker 1: It is more like a city that grew from one seed.
• 35:02
  Speaker 1: In the deep some siphonophores glow with cascades of blue
• 35:07
  Speaker 1: light that travel along the body, as if a small
• 35:11
  Speaker 1: comet were unspooling across the night. Jellyfish, more broadly, are
• 35:16
  Speaker 1: clocks that keep their own hours. Most are water arranged
• 35:21
  Speaker 1: into a bell and some trailing threads, yet within this
• 35:26
  Speaker 1: simplicity are feats that sound like fables. A small species
• 35:30
  Speaker 1: famous for its trick of renewal, can return from the
• 35:33
  Speaker 1: adult phase to a juvenile stage when stressed, as if
• 35:37
  Speaker 1: a butterfly could become a caterpillar again and try once more.
• 35:42
  Speaker 1: Other jellies show discipline and endurance that suit the deep.
• 35:48
  Speaker 1: The crown-shaped jelly, often called the alarm jelly, carries a
• 35:53
  Speaker 1: small light at its centre and rings it when attacked.
• 35:57
  Speaker 1: not to startle the predator, but to summon a larger
• 36:01
  Speaker 1: one that may drive the first attacker away. Some jellies
• 36:05
  Speaker 1: share their bells with fish that shelter within the curtains
• 36:08
  Speaker 1: and steal a ride to better feeding grounds. The rhythm
• 36:12
  Speaker 1: of these animals is not frantic. Bells pulse and relax
• 36:17
  Speaker 1: in a patient metronome. In tanks at research labs, they
• 36:22
  Speaker 1: sometimes swim in perfect time with the clock upon the wall.
• 36:27
  Speaker 1: Look closely at certain fish and the skull seems to
• 36:31
  Speaker 1: house mirrors. In the dim places where the brightest light
• 36:36
  Speaker 1: is a blue whisper, lenses alone are not the only answer.
• 36:41
  Speaker 1: Some barrel-eye fish use reflective plates made of guanine crystals
• 36:46
  Speaker 1: to direct scarce photons onto their retinas. Mirror eyes allow
• 36:52
  Speaker 1: them to collect more of the light that comes from
• 36:55
  Speaker 1: faint glows and from the soft sky above. In a
• 36:59
  Speaker 1: few species, the eyes point upward under a clear dome
• 37:03
  Speaker 1: that protects the delicate tubes while also letting stray light
• 37:08
  Speaker 1: reach the retina. The effect departs from expectations. Instead of
• 37:14
  Speaker 1: a face that looks forward, the head is a periscope
• 37:17
  Speaker 1: aimed at ceilings. Bone follows suit. Many deep-sea fish have
• 37:23
  Speaker 1: skeletons that are thin and partly cartilaginous. There is no
• 37:28
  Speaker 1: need for heavy armour in a world without surf or
• 37:32
  Speaker 1: breaking waves. Some forms are so clear that you can
• 37:36
  Speaker 1: read the shape of their organs as if through glass.
• 37:41
  Speaker 1: Rather than a lack, this transparency is a precise solution
• 37:46
  Speaker 1: to the problem of being seen by hungry neighbours. The
• 37:51
  Speaker 1: deep speaks in sound, and if you stay very still,
• 37:55
  Speaker 1: you can hear its choir. There is a natural channel
• 37:59
  Speaker 1: within the ocean, a layer where the speed of sound
• 38:02
  Speaker 1: is lowest. Sound that enters this layer bends back toward it,
• 38:07
  Speaker 1: and can travel great distances with little loss. Along this path,
• 38:12
  Speaker 1: blue whales and fin whales send phrases that can circle
• 38:18
  Speaker 1: ocean basins. A single note by a blue whale can
• 38:21
  Speaker 1: be felt by instruments hundreds of kilometers away. Sperm whales
• 38:27
  Speaker 1: make a sonar of sharp clicks that scan like a
• 38:31
  Speaker 1: lighthouse beam. Each click is a packet of sound shaped
• 38:36
  Speaker 1: by special lips inside the head and reflected by air-filled chambers.
• 38:41
  Speaker 1: In the shallows, shrimps crack their small claws to create
• 38:45
  Speaker 1: bubbles that collapse with a tiny thunder. When many shrimps
• 38:50
  Speaker 1: snap together, the sea becomes a fireplace of crackles. In
• 38:55
  Speaker 1: polar seas, the slow shifting of ice gives groans and
• 38:58
  Speaker 1: squeals like the hinges of a cathedral door. The deep
• 39:04
  Speaker 1: is not hushed. It is attentive and layered, a soundscape
• 39:09
  Speaker 1: with both lullabies and drums. Down on the sea floor
• 39:14
  Speaker 1: the sand keeps notes. Trails left by sea cucumbers write
• 39:18
  Speaker 1: long cursive lines that loop in patient arcs. Starfish stamp
• 39:23
  Speaker 1: small star-shaped imprints and then erase them as arms lift
• 39:28
  Speaker 1: and fall. Rays leave angel wing prints where they have
• 39:32
  Speaker 1: settled and then flown away. There are mysterious spirals that
• 39:37
  Speaker 1: mark where worms have farmed the sediment, and ridges that
• 39:41
  Speaker 1: show where currents have pushed grains into regular patterns. Here
• 39:46
  Speaker 1: and there sit manganese nodules as round as potatoes. They
• 39:52
  Speaker 1: grow incredibly slowly as metals collect around small cores, perhaps
• 39:57
  Speaker 1: a fish tooth or a bit of shell. A few
• 40:00
  Speaker 1: millimetres per million years is their pace, a patience that
• 40:04
  Speaker 1: is difficult to hold in the mind. Pebbles called dropstones
• 40:09
  Speaker 1: rest on plains of fine mud. They fell from the
• 40:12
  Speaker 1: bottoms of icebergs that melted and released their cargo. Even
• 40:18
  Speaker 1: far from ice you may find the long ribs of
• 40:21
  Speaker 1: a whale, half buried with tiny snails grazing the film
• 40:26
  Speaker 1: upon the bone. To read these traces you do not
• 40:30
  Speaker 1: need a key, only time and a soft gaze. The
• 40:34
  Speaker 1: bottom writes in a script that cares nothing for hurry.
• 40:38
  Speaker 1: Lift your view and the horizon of the deep is
• 40:42
  Speaker 1: not a flat line, but a skyline of peaks. Underwater mountains,
• 40:47
  Speaker 1: known as seamounts, rise from the plains, and broad plateaus
• 40:52
  Speaker 1: stretch like submerged continents. Many have flat tops, because they
• 40:57
  Speaker 1: once were islands, trimmed level by waves, before the crust
• 41:02
  Speaker 1: moved and the islands sank. Such flat-topped forms are called guillotes,
• 41:08
  Speaker 1: a word that sounds like a bell when spoken slowly.
• 41:12
  Speaker 1: Seamounts gather life by interrupting current. Water accelerates as it
• 41:18
  Speaker 1: moves up the slopes and eddies form on the lee side.
• 41:22
  Speaker 1: Plankton concentrates. Small fish hunt the plankton. Larger fish circle
• 41:27
  Speaker 1: the small ones. Corals that prefer cold water and no
• 41:32
  Speaker 1: sunlight build thickets that climb into low forests. Some of
• 41:37
  Speaker 1: these coral gardens are centuries old, with branches bumpy from
• 41:42
  Speaker 1: the slow work of tiny animals. On the summits of
• 41:46
  Speaker 1: the ridges you can find fields of glass sponges that
• 41:49
  Speaker 1: look like frozen fountains. These structures filter the passing water
• 41:55
  Speaker 1: and stitch together silica like patient lace makers. Currents treat
• 42:01
  Speaker 1: seamounts as hills treat wind. Over the peak, a standing
• 42:05
  Speaker 1: wave may form in the water. On the downstream side,
• 42:10
  Speaker 1: a slowly turning cell of water called a Taylor column
• 42:14
  Speaker 1: can hover, as if the mountain were holding a bowl
• 42:17
  Speaker 1: of fluid in place above its summit. Within this bowl,
• 42:22
  Speaker 1: larvae of many species find a home and grow until
• 42:27
  Speaker 1: they are ready to leave. In this way, a mountain
• 42:30
  Speaker 1: creates a neighbourhood in the middle of a plain. Fishers
• 42:34
  Speaker 1: know these places as sources of abundance. Scientists map them
• 42:40
  Speaker 1: as stepping stones for species that would otherwise be scattered.
• 42:45
  Speaker 1: The shapes of these mountains also guide large-scale flows. Chains
• 42:50
  Speaker 1: of seamounts lie like beads upon the strings. where tectonic
• 42:55
  Speaker 1: plates once moved over hot plumes in the mantle. The
• 43:00
  Speaker 1: tracks they write across the ocean floor are quiet biographies
• 43:05
  Speaker 1: of the crust. Sometimes, the mountains split and the ridges
• 43:10
  Speaker 1: reveal their centres. There, along the mid-ocean ridge system, the
• 43:15
  Speaker 1: planet renews its surface. Magma rises and cools and becomes
• 43:20
  Speaker 1: new crust. As it spreads, it pulls the ridges apart.
• 43:25
  Speaker 1: Valleys form at the summit, named rift valleys. On their
• 43:29
  Speaker 1: walls are fresh basalts striped with minerals that recorded the
• 43:34
  Speaker 1: direction of the planet's magnetic field at the moment they froze.
• 43:39
  Speaker 1: Over long time, the alternation of magnetic directions forms a
• 43:43
  Speaker 1: barcode written in stone. This has given geologists a way
• 43:48
  Speaker 1: to time the birth of crust and to measure the
• 43:51
  Speaker 1: motion of plates. Even here, life has a hold. Tiny
• 43:55
  Speaker 1: snails and limpets graze upon films of bacteria. Shrimps crowd
• 44:01
  Speaker 1: into cracks where warm water leaks. The hiss of hot
• 44:05
  Speaker 1: fluids and the fall of cold water create a small
• 44:09
  Speaker 1: weather within the larger ocean, with plumes and drifts and
• 44:13
  Speaker 1: quiet snows of mineral dust. If you wonder how the
• 44:18
  Speaker 1: deep endures, consider how slow its clocks run. Animals can
• 44:23
  Speaker 1: take years to mature. Reproduction can be tied to gently
• 44:27
  Speaker 1: falling cues such as the arrival of spring particles from
• 44:32
  Speaker 1: the surface or the small seasonal changes in current. Some
• 44:37
  Speaker 1: fish lay eggs upon the bottom that remain dormant until
• 44:41
  Speaker 1: a particular texture of water arrives to awaken them. The
• 44:45
  Speaker 1: patience of the deep is not a burden. It is
• 44:49
  Speaker 1: an economy. Wastes become resources. Even the bodies of the
• 44:54
  Speaker 1: dead are more than endings. A whale fall is not
• 44:58
  Speaker 1: only a banquet for a few months. It is a
• 45:01
  Speaker 1: career path for worms and a workshop for microbes that
• 45:05
  Speaker 1: drill into bone and extract an energy source not usually available.
• 45:11
  Speaker 1: Over many seasons, the colony changes partners again and again
• 45:16
  Speaker 1: until nothing is left but a faint rise in the mud.
• 45:21
  Speaker 1: The stories of discovery here are unhurried as well. The
• 45:25
  Speaker 1: first vents were photographed late in the decade when the
• 45:29
  Speaker 1: word disco meant a kind of dance. The first global
• 45:34
  Speaker 1: maps of the ocean floor were sketched by listening to echoes.
• 45:38
  Speaker 1: and by measuring gravity from ships that crossed impatient grids.
• 45:43
  Speaker 1: Now satellites sense small changes in sea surface height that
• 45:48
  Speaker 1: reveal the mass of mountains below. Robots dive, watch, and
• 45:54
  Speaker 1: return with films that are as serene as they are surprising.
• 45:59
  Speaker 1: We give these machines names that sound friendly. We paint
• 46:03
  Speaker 1: them bright yellow and orange so the sea will not
• 46:06
  Speaker 1: lose them. They look ungainly on deck. In the water
• 46:11
  Speaker 1: they move with the grace of seals. They teach us
• 46:15
  Speaker 1: that wonder does not diminish with expertise. It grows. Let
• 46:21
  Speaker 1: your thoughts circle back across these scenes, cities of tube-worms
• 46:26
  Speaker 1: fed by invisible kitchens. snowdrifts of methane ice that can
• 46:31
  Speaker 1: be set alight in the open air, cathedrals built by
• 46:34
  Speaker 1: single-celled architects using glass, slow giants that do not need
• 46:41
  Speaker 1: to eat for seasons, fleets made of colonies that snake
• 46:45
  Speaker 1: like living comets, bells that ring without sound but in
• 46:49
  Speaker 1: perfect time with the sea, eyes that are mirrors, skulls
• 46:54
  Speaker 1: that are windows, bones that are suggestions rather than walls,
• 46:59
  Speaker 1: choirs of clicks that survey the night, rumblings that drift
• 47:04
  Speaker 1: like fog, crackles that write the weather of shrimp, trails
• 47:09
  Speaker 1: on the bottom that spell out the cursive of hunger
• 47:12
  Speaker 1: and rest, mountains that keep bowls of water in the
• 47:15
  Speaker 1: lee of their summits, and plateaus that once were islands
• 47:19
  Speaker 1: reading aloud the long travel of plates. Every one of
• 47:23
  Speaker 1: these details is true in spirit and in fact, and
• 47:27
  Speaker 1: yet the deep remains larger than any list. The best
• 47:32
  Speaker 1: way to carry it with you is not as a
• 47:34
  Speaker 1: catalogue but as a feeling. The deep is patient, generous
• 47:39
  Speaker 1: and full of small economies. It wastes nothing and it
• 47:44
  Speaker 1: complains of nothing. It holds memories so long that our
• 47:48
  Speaker 1: own memories seem like glints upon a wave. When you
• 47:53
  Speaker 1: breathe out tonight, imagine that your breath joins the long
• 47:57
  Speaker 1: exchange that links air to sea and sea to rock.
• 48:02
  Speaker 1: Somewhere a vent will open. Somewhere a worm will raise
• 48:07
  Speaker 1: a red plume into warm shadow. Somewhere a siphonophore will
• 48:11
  Speaker 1: thread its lights across an unseen avenue. Somewhere miles below,
• 48:16
  Speaker 1: in pressure you cannot feel, A fish with mirror eyes
• 48:20
  Speaker 1: will look up through a dome of living glass and
• 48:23
  Speaker 1: see the faint sky of noon filtered into blue. If
• 48:27
  Speaker 1: sleep comes now, you will be in good company. The
• 48:31
  Speaker 1: deep has been sleeping and waking for a very long time,
• 48:36
  Speaker 1: and it has never missed a tide. Far from the
• 48:40
  Speaker 1: bright corals of the tropics, where parrots of fish nibble
• 48:44
  Speaker 1: stone into sand and sunlight ripples over bright gardens, there
• 48:49
  Speaker 1: are forests that grow with no day at all. Picture
• 48:54
  Speaker 1: wide slopes on the edges of northern seas, the water
• 48:58
  Speaker 1: cold and heavy, the current steady as breath during sleep.
• 49:03
  Speaker 1: Out of that current rise pale branches. They are stony
• 49:07
  Speaker 1: and delicate and entirely alive. These are cold water corals,
• 49:12
  Speaker 1: builders that ask nothing from the sun. Their polyps, which
• 49:17
  Speaker 1: are tiny animals with soft crowns of tentacles, feed by
• 49:21
  Speaker 1: plucking passing particles from the water. Bit by patient bit,
• 49:26
  Speaker 1: they lay down skeletons of limestone. Species such as Lophelia
• 49:32
  Speaker 1: and Madripora, names that sound like a chant, make thickets
• 49:36
  Speaker 1: and then cliff faces. and with centuries they raise entire
• 49:40
  Speaker 1: reefs taller than city towers. Skeletons keep their own calendars.
• 49:45
  Speaker 1: A thin band records a winter of poor food. A
• 49:50
  Speaker 1: thicker band records a summer flood of plankton. Through these bands,
• 49:55
  Speaker 1: scientists can read a slow diary of climate and current,
• 50:00
  Speaker 1: written in stone by creatures that have never seen daylight.
• 50:05
  Speaker 1: These dark reefs are not empty. Red fish with big
• 50:09
  Speaker 1: eyes hover as if considering a problem. Crabs stand as
• 50:14
  Speaker 1: still as statues until a food scent reaches them, and
• 50:17
  Speaker 1: then they move with crisp purpose. Starfish patrol like careful gardeners,
• 50:23
  Speaker 1: turning over pebbles to search the underside for mussels. Cold
• 50:27
  Speaker 1: water sponges rise like dull candles and filter and whisper.
• 50:32
  Speaker 1: The corals themselves serve as nurseries for the young of
• 50:36
  Speaker 1: many fish that seek shelter among the branches, while their
• 50:40
  Speaker 1: bones thicken and their scales harden. When a branch breaks,
• 50:46
  Speaker 1: it tumbles into a hollow and becomes the seed of
• 50:49
  Speaker 1: a new clump. Here the sea puts down roots without leaves.
• 50:55
  Speaker 1: The forest stands in a night that is all seasons
• 50:59
  Speaker 1: at once. On the broad plains beyond those forests, the
• 51:03
  Speaker 1: snow of the sea falls quietly, the tiny remains of
• 51:07
  Speaker 1: surface life drifting down like the faintest of rain. Sometimes, though,
• 51:13
  Speaker 1: the deep receives a feast, a great whale lives a
• 51:16
  Speaker 1: long life, and then, when time finishes its patient circle,
• 51:21
  Speaker 1: the body numbers one last journey down. At first, the
• 51:26
  Speaker 1: fall looks like a soft dart in the blue, a
• 51:29
  Speaker 1: suggestion of motion in a world where motion is rare.
• 51:33
  Speaker 1: Then the body rests and the news spreads on scents
• 51:38
  Speaker 1: through the water. Eels arrive and hagfish knot themselves to
• 51:42
  Speaker 1: gain purchase and tear. Sharks appear out of the dusk
• 51:47
  Speaker 1: and depart the same way, anonymous as thoughts. The first
• 51:51
  Speaker 1: stage is a banquet. In weeks or months, the last
• 51:56
  Speaker 1: scraps of soft tissue are gone Now comes the long meal.
• 52:01
  Speaker 1: Bacteria create white quilts across the bones and draw energy
• 52:06
  Speaker 1: from the chemicals that drift from the fat that is
• 52:10
  Speaker 1: still tucked within the marrow. These bacteria leave a film
• 52:14
  Speaker 1: that other animals graze. Mussels settle as tiny specks and
• 52:20
  Speaker 1: grow into dense clusters. Worms that carry symbiotic microbes drill
• 52:25
  Speaker 1: into bone. and sip the chemistry there the way a
• 52:28
  Speaker 1: tree sends roots into soil. Shrimp and snails creep over
• 52:33
  Speaker 1: the surfaces like deliberate rain. This second stage of the
• 52:37
  Speaker 1: whale fall can last for years, sometimes for decades. An
• 52:43
  Speaker 1: island of life rises where moments earlier there was only
• 52:46
  Speaker 1: the usual procession of sediment. When at last the bones
• 52:51
  Speaker 1: soften and sink into the mud, The island fades back
• 52:56
  Speaker 1: into sea. The deep wastes nothing. It knows how to
• 53:01
  Speaker 1: turn a single body into a city that feeds a
• 53:05
  Speaker 1: hundred species. Lift your gaze from the bottom toward mid-water
• 53:10
  Speaker 1: where brightness is a rumour. Here stretches the world's largest elevator.
• 53:15
  Speaker 1: Each day when the sun sets, an entire nation of
• 53:19
  Speaker 1: small animals rises. When the sun returns, they descend again
• 53:24
  Speaker 1: This daily journey is called vertical migration and it is
• 53:29
  Speaker 1: not a parade of a few meters. It is a
• 53:32
  Speaker 1: climb and a descent of many hundreds of meters, sometimes
• 53:37
  Speaker 1: close to a kilometer. Tiny crustaceans, small fishes, squid and
• 53:42
  Speaker 1: jellies follow the turning of light with astonishing precision. Rising
• 53:48
  Speaker 1: allows them to feed under the cover of darkness upon
• 53:52
  Speaker 1: the rich plankton near the surface. Descending returns them to
• 53:56
  Speaker 1: the relative safety of the dim layer where their bodies
• 54:00
  Speaker 1: are less visible to hunters. The movement is so dense
• 54:05
  Speaker 1: that ships using sonar see a false bottom, a ghostly
• 54:09
  Speaker 1: sea floor that rises at dusk and sinks at dawn.
• 54:14
  Speaker 1: This is the largest movement of biomass on Earth, measured
• 54:18
  Speaker 1: by distance and number, and it happens every single day.
• 54:24
  Speaker 1: of every single year without fanfare. It is the slow
• 54:28
  Speaker 1: pulse of the ocean. Now imagine a coastline with a
• 54:33
  Speaker 1: high mountain range on land. The rivers there carry silt
• 54:37
  Speaker 1: down to the sea. Winter storms carve the shelf with
• 54:41
  Speaker 1: sudden energy. The result is a system of canyons cut
• 54:45
  Speaker 1: below the waves. They are as dramatic as their cousins
• 54:49
  Speaker 1: on land. with walls that rise for hundreds of meters
• 54:53
  Speaker 1: and floors that meander in graceful curves. Currents run within
• 54:58
  Speaker 1: them like cold rivers inside a colder sea. Sediment can
• 55:02
  Speaker 1: suddenly surge downward in an underwater avalanche, turning clear water
• 55:08
  Speaker 1: into a dense flow that tumbles blocks and carves new bends.
• 55:13
  Speaker 1: These are called turbidity currents, but the name does not
• 55:17
  Speaker 1: capture the quiet drama. Imagine pebbles drifting like leaves only
• 55:22
  Speaker 1: much heavier, and imagine dunes forming and moving without a
• 55:26
  Speaker 1: sound of wind. At the head of some canyons there
• 55:30
  Speaker 1: are plunges as impressive as any land waterfall. The largest
• 55:35
  Speaker 1: waterfall on the planet is not on land at all.
• 55:39
  Speaker 1: It lies in the Denmark Strait between Greenland and Iceland.
• 55:44
  Speaker 1: Their dense water from the north spills into a deep
• 55:48
  Speaker 1: basin of less dense water and falls for more than
• 55:52
  Speaker 1: three kilometres. You cannot stand beside it and feel spray
• 55:57
  Speaker 1: on your face, but you can measure it as a
• 56:00
  Speaker 1: cold river that never sees the sky. Elsewhere, slow slumps
• 56:05
  Speaker 1: reshape the canyon walls. The Storegga slide off the coast
• 56:10
  Speaker 1: of Norway happened in the far past, but traces of
• 56:13
  Speaker 1: its huge movement remain as a warning of the power
• 56:17
  Speaker 1: that sleeps in the margins of continents. Submarine canyons focus
• 56:23
  Speaker 1: life as well. Water rushing through brings food, and fish
• 56:29
  Speaker 1: ascend and descend those corridors as if travelling a familiar road.
• 56:36
  Speaker 1: On seemingly empty plains where sand and silt stretch in
• 56:41
  Speaker 1: quiet tones, patches of life gather wherever a little structure
• 56:45
  Speaker 1: breaks the monotony. A single boulder fallen from a melting
• 56:50
  Speaker 1: iceberg long ago can host an entire garden. Pink anemones
• 56:55
  Speaker 1: stand like small sunset flames. Brittle stars set their arms
• 57:00
  Speaker 1: like nets around the stone and wait for passing food.
• 57:04
  Speaker 1: Tubes built from glued sand rise like delicate chimneys and
• 57:08
  Speaker 1: small worms peer from their entrances, as if considering the weather.
• 57:14
  Speaker 1: When bones arrive, the transformation is even more striking. We
• 57:19
  Speaker 1: have already visited the banquet of a whale. Even the
• 57:23
  Speaker 1: skeleton of a large fish or the skull of a
• 57:26
  Speaker 1: seal can feed an entire village of scavengers and grazers
• 57:30
  Speaker 1: for a long season. On the bottom, Architecture is any
• 57:35
  Speaker 1: raised object, any fence for the current to comb, any
• 57:39
  Speaker 1: edge that says stop to grains of sand. The sea
• 57:43
  Speaker 1: uses these small opportunities with inventive grace. At the scale
• 57:48
  Speaker 1: of continents, the ocean floor is a place of birth.
• 57:53
  Speaker 1: Along the mid-ocean ridges, the thin crust of the planet
• 57:56
  Speaker 1: pulls apart, and magma rises to fill the space. The
• 58:01
  Speaker 1: new rock It touches cold water and chills into forms,
• 58:05
  Speaker 1: called pillows, that look like smooth loaves of bread. The
• 58:09
  Speaker 1: surfaces crack and new skin forms over fresh melt, and
• 58:14
  Speaker 1: all of it slides away from the ridge like cooled
• 58:17
  Speaker 1: wax slid from a seam. On either side, the plates
• 58:21
  Speaker 1: move in slow opposite directions, a few centimetres in a year,
• 58:27
  Speaker 1: which is still enough to rearrange the entire world given time.
• 58:31
  Speaker 1: From above, the ridge is a line drawn along the
• 58:35
  Speaker 1: middle of the ocean basins, a seam of creation. Earthquakes
• 58:40
  Speaker 1: along this seam are usually small and gentle, as if
• 58:43
  Speaker 1: the crust were sighing. Where an offset breaks the seam
• 58:47
  Speaker 1: into sections, Straight fissures cut at right angles and become
• 58:52
  Speaker 1: corridors for currents and for the wandering lives that follow
• 58:56
  Speaker 1: ridges as if following hedgerows across a dark landscape. Not
• 59:03
  Speaker 1: all the new crust stays quiet where the crust is
• 59:07
  Speaker 1: thin or a plume rises flat. from deep within the mantle,
• 59:12
  Speaker 1: submarine volcanoes grow. Quite a few lie near island arcs
• 59:17
  Speaker 1: where one plate sinks under another and water from the
• 59:20
  Speaker 1: subducted slab encourages rock to melt and rise. A submarine
• 59:26
  Speaker 1: eruption is not like a land outburst that sends ash
• 59:30
  Speaker 1: into sunlit skies. It is hot, dark water billowing like ink.
• 59:35
  Speaker 1: Pillow lavas pile upon pillow lavas as if a baker
• 59:39
  Speaker 1: were hurriedly stacking loaves. Volcanic glass forms when droplets of
• 59:44
  Speaker 1: melt meet water so quickly that crystals cannot grow, and
• 59:49
  Speaker 1: this glass, ground by waves and currents, becomes black sand
• 59:54
  Speaker 1: on nearby beaches. The chemistry of these eruptions matters to life.
• 1:00:00
  Speaker 1: Ash and altered rock release iron and other micronutrients that
• 1:00:04
  Speaker 1: drift and fertilise wide patches of ocean, as if someone
• 1:00:08
  Speaker 1: had shaken a bag of food over a field. A
• 1:00:11
  Speaker 1: volcano is not only a furnace. It is also a
• 1:00:16
  Speaker 1: slow gardener. There are places where ice hides entire seas.
• 1:00:22
  Speaker 1: Under the thick ice of Antarctica lie lakes that have
• 1:00:26
  Speaker 1: been sealed for more than many thousands of years. Lake Vostok,
• 1:00:31
  Speaker 1: named with the Russian word for east, is the largest
• 1:00:34
  Speaker 1: of them. It is covered by ice nearly four kilometres thick.
• 1:00:39
  Speaker 1: And yet deep below, water remains liquid, warmed by the
• 1:00:45
  Speaker 1: gentle heat from the earth and pressed by the weight
• 1:00:48
  Speaker 1: of the ice to stay fluid. Channels thread through the
• 1:00:52
  Speaker 1: base of the ice sheet and link lake to lake,
• 1:00:56
  Speaker 1: like arteries in a sleeping giant. Similar systems exist in
• 1:01:01
  Speaker 1: Greenland where summer melt-feeds rivers that dive into crevasses and
• 1:01:06
  Speaker 1: roar along the bed beneath the ice. These under-ice rivers
• 1:01:10
  Speaker 1: carry silt and grind bedrock, and the material they deliver
• 1:01:15
  Speaker 1: to the sea becomes food for plankton blooms when sunlight returns.
• 1:01:20
  Speaker 1: In the very cold waters along the Antarctic shelf, brine
• 1:01:25
  Speaker 1: forms as young sea ice freezes and rejects salt. The
• 1:01:29
  Speaker 1: brine sinks in shimmering streams called brinicles and can freeze
• 1:01:35
  Speaker 1: small sea creatures if it touches them. Even here, in
• 1:01:39
  Speaker 1: what seems the quietest corner of the ocean, the water
• 1:01:43
  Speaker 1: is busy with hidden roads. If you dissolve a forest,
• 1:01:47
  Speaker 1: where does its memory go? Rain washes charcoal from wildfires
• 1:01:52
  Speaker 1: into rivers. Soil releases the dark residues of wood. The
• 1:01:57
  Speaker 1: sum of these is often called black carbon. Some of
• 1:02:01
  Speaker 1: it travels down to the sea in a form so
• 1:02:04
  Speaker 1: fine that it becomes part of the ocean's dissolved library.
• 1:02:09
  Speaker 1: There it joins organic molecules from plankton and from ancient peatlands.
• 1:02:15
  Speaker 1: It drifts on currents for decades or centuries. Scientists read
• 1:02:20
  Speaker 1: this faint ink with instruments that can weigh atoms and
• 1:02:24
  Speaker 1: separate voices that sound the same to less careful ears.
• 1:02:29
  Speaker 1: Within that dissolved library are clues to old climates, to
• 1:02:33
  Speaker 1: the pace of rivers, and to the breathing of continents.
• 1:02:38
  Speaker 1: The ocean thus holds stories, not only of its own life,
• 1:02:43
  Speaker 1: but also of forests and fires and the slow work
• 1:02:47
  Speaker 1: of soil. When we say that the ocean stores carbon,
• 1:02:50
  Speaker 1: we do not speak only of shells and skeletons that sink.
• 1:02:55
  Speaker 1: We also mean the black poems of burned wood, and
• 1:02:59
  Speaker 1: the subtle letters of humus, all held in the long,
• 1:03:04
  Speaker 1: cool pages of seawater. And now back to the smallest citizens,
• 1:03:10
  Speaker 1: the ones so tiny that a thousand could fill a
• 1:03:13
  Speaker 1: pinhead and still have room to dance. They are the
• 1:03:17
  Speaker 1: engineers and caretakers of the deep. Microbes sit on mineral
• 1:03:22
  Speaker 1: surfaces and change them by quiet abilities. Some breathe iron,
• 1:03:27
  Speaker 1: turning its form and its solubility. Others breathe sulphur or manganese.
• 1:03:33
  Speaker 1: Some fix nitrogen into forms other creatures can use. A
• 1:03:38
  Speaker 1: special group called Anamox bacteria perform a chemistry whose quiet
• 1:03:43
  Speaker 1: name hides a powerful service. They take ammonium and nitrite
• 1:03:49
  Speaker 1: and turn them into nitrogen gas, which then slips back
• 1:03:52
  Speaker 1: to the air. In doing so, They remove forms of
• 1:03:56
  Speaker 1: nitrogen that in excess would choke the seas with algae. Archaea,
• 1:04:03
  Speaker 1: cousins of bacteria with ancient lineage, oxidise ammonia in the
• 1:04:08
  Speaker 1: dark and release energy to power themselves, recycling and cleansing
• 1:04:14
  Speaker 1: as they go. Microbes also build. They precipitate minerals that
• 1:04:20
  Speaker 1: cement loose sand into crust, a skin that keeps dunes
• 1:04:24
  Speaker 1: from wandering. They lay down thin layers of carbonate that
• 1:04:28
  Speaker 1: grow into pavements upon which larger corals can later anchor.
• 1:04:35
  Speaker 1: On the stems of grasses in shallow seas, they grow
• 1:04:39
  Speaker 1: as sheaths that protect the plant from rot and from
• 1:04:42
  Speaker 1: grazing mouths. On the hulls of ships, they build communities
• 1:04:47
  Speaker 1: that engineers must gently remove. In the deep, they gather
• 1:04:51
  Speaker 1: on the surface of small plastic pieces and create what
• 1:04:55
  Speaker 1: researchers call a plastisphere, which is a tiny floating city
• 1:05:00
  Speaker 1: where flows of carbon and nitrogen are rerouted and softened.
• 1:05:06
  Speaker 1: Even the clear water far from land that looks empty
• 1:05:10
  Speaker 1: as glass is full of microbial work. Each drop holds
• 1:05:15
  Speaker 1: time and chemistry. Each drop is a community where vents
• 1:05:20
  Speaker 1: breathe and seep stream. Microbes link rocks to animals. Deep
• 1:05:26
  Speaker 1: sea snails near vents carry iron sulfide scales like tiny
• 1:05:31
  Speaker 1: shields and at their feet they farm bacteria that turn
• 1:05:35
  Speaker 1: chemicals into the nutrition that keeps the snails alive. Shrimps
• 1:05:41
  Speaker 1: on the mid-Atlantic ridge house microbes in their gill chambers
• 1:05:45
  Speaker 1: and graze them like livestock. Tube worms, which we met earlier,
• 1:05:51
  Speaker 1: give most of their body space to microbes and use
• 1:05:55
  Speaker 1: richly oxygenated blood to carry sulfide and oxygen to their partners.
• 1:06:01
  Speaker 1: The word partnership fits well here. Neither partner could live
• 1:06:06
  Speaker 1: alone in that setting. Together they make a small economy
• 1:06:10
  Speaker 1: in a place that seems to have no coins at all.
• 1:06:15
  Speaker 1: In all these scenes, from cold, dark coral forests to
• 1:06:19
  Speaker 1: the under-ice rivers, from silent waterfalls to newborn crust, one
• 1:06:24
  Speaker 1: thread keeps its gentle pull. The deep ocean is not
• 1:06:28
  Speaker 1: a void. It is an attentive listener and an exact accountant.
• 1:06:33
  Speaker 1: It takes what gravity gives it and builds neighborhoods. It
• 1:06:37
  Speaker 1: turns rare events such as a fallen whale into long lives.
• 1:06:42
  Speaker 1: It writes in glass and in limestone and in dissolving ink.
• 1:06:46
  Speaker 1: It revises and revisits. It wastes very little and forgets
• 1:06:52
  Speaker 1: very slowly. For a traveller who visits only in thought,
• 1:06:56
  Speaker 1: the greatest surprise is how comforting that carefulness feels. You
• 1:07:01
  Speaker 1: imagine yourself hovering over a coral thicket that has never
• 1:07:06
  Speaker 1: seen the sun, and your heart rate slows to match
• 1:07:10
  Speaker 1: the current. You picture the slow elevator of night. rising
• 1:07:15
  Speaker 1: and falling with the quiet discipline of the planet, and
• 1:07:18
  Speaker 1: your breathing matches the pulse. You envision a waterfall in
• 1:07:24
  Speaker 1: the Denmark Strait, falling for many kilometers in darkness, and
• 1:07:28
  Speaker 1: the sound is not a roar but a whisper. You
• 1:07:32
  Speaker 1: think of microbes holding hands with minerals and turning waste
• 1:07:36
  Speaker 1: back into weather, and it feels like an old house
• 1:07:41
  Speaker 1: in order. Rest your thoughts on one last image. A
• 1:07:45
  Speaker 1: basalt pillow, still warm from its birth, breathes out heat
• 1:07:50
  Speaker 1: into water just above freezing. A thin film of bacteria
• 1:07:54
  Speaker 1: forms upon its shiny skin, a first coat of life.
• 1:07:59
  Speaker 1: Over years a sponge anchors to that skin and grows
• 1:08:02
  Speaker 1: a delicate cup, and within that cup a small shrimp
• 1:08:06
  Speaker 1: chooses a home and spends its entire life in that
• 1:08:10
  Speaker 1: one room of the cathedral. Above, in mid-water, a siphonophore
• 1:08:14
  Speaker 1: strings itself like a long necklace and glides with lights
• 1:08:20
  Speaker 1: that are small as a sigh. Far away and far below,
• 1:08:24
  Speaker 1: black carbon from an ancient fire finally meets a bacterium
• 1:08:29
  Speaker 1: that knows how to read it and return its letters
• 1:08:32
  Speaker 1: to the cycle. Nothing is lost. Everything is slowly rearranged.
• 1:08:39
  Speaker 1: The abyss is not a mouth that swallows. It is
• 1:08:43
  Speaker 1: a pair of careful hands that holds. The river of
• 1:08:48
  Speaker 1: light that the surface gives to the ocean thins to
• 1:08:51
  Speaker 1: a soft film, and then to nothing at all. Here
• 1:08:56
  Speaker 1: the water keeps other records. It keeps the very small,
• 1:09:01
  Speaker 1: the threads and crumbs that have slipped from our hands
• 1:09:05
  Speaker 1: and our factories and our clothes. The travellers are synthetic
• 1:09:09
  Speaker 1: and they carry the long memory of plastic. At first
• 1:09:14
  Speaker 1: they are bottles and bags and handles that float and
• 1:09:17
  Speaker 1: gather in slow spirals beneath steady winds. Salt and sun
• 1:09:23
  Speaker 1: and waves and sharp beaks wear them down. Fibres arrive
• 1:09:28
  Speaker 1: from washing machines by the thousands in a single load
• 1:09:32
  Speaker 1: of laundry and pass through rivers like fine confetti. Tyres
• 1:09:36
  Speaker 1: exhale black dust that rides rain into estuaries. With time,
• 1:09:42
  Speaker 1: The pieces become small enough to move with plankton. They
• 1:09:46
  Speaker 1: join the slow snow and fall. On their journey, films
• 1:09:51
  Speaker 1: of microbes colonise them and change their behaviour. The pieces
• 1:09:55
  Speaker 1: become heavier for a while and sink, then lighten as
• 1:09:59
  Speaker 1: the film changes and rise again. This seesaw carries them
• 1:10:04
  Speaker 1: up and down through layers like travellers who cannot decide
• 1:10:08
  Speaker 1: which floor to visit. Fish mistake them for prey. Birds
• 1:10:13
  Speaker 1: dip and swallow. The very small, called copepods, taste them
• 1:10:19
  Speaker 1: and move on, leaving scratches on the surface like writing.
• 1:10:23
  Speaker 1: In the deep, where currents wander without sun, the pieces
• 1:10:27
  Speaker 1: finally rest within the mud. Cores lifted from the seafloor
• 1:10:32
  Speaker 1: reveal thin layers like calendar pages. A distant storm increases
• 1:10:38
  Speaker 1: river flow and a darker line forms. A flood carries
• 1:10:42
  Speaker 1: clothing fibres and a pale band appears. This is how
• 1:10:46
  Speaker 1: the ocean files our habits. The filing is silent. The
• 1:10:51
  Speaker 1: ocean also edits. On the surface, bacteria begin to chew
• 1:10:55
  Speaker 1: the carbon chains. On the bottom, worms bury what they
• 1:10:59
  Speaker 1: cannot use and reduce harm by dilution. The lesson is
• 1:11:04
  Speaker 1: unhurried but clear. The sea forgets slowly. Past the plains
• 1:11:09
  Speaker 1: of fine sediment rise shapes that were once swift. Shipwrecks
• 1:11:14
  Speaker 1: lie like iron reefs along the roots of current and commerce.
• 1:11:19
  Speaker 1: Some went down in war, some in weather, some through
• 1:11:23
  Speaker 1: a single mistake in a narrow channel on a foggy morning.
• 1:11:27
  Speaker 1: Their ribs arch like the frames of cathedrals without roofs.
• 1:11:32
  Speaker 1: Rust works as a sculptor. Orange stalactites grow that divers
• 1:11:37
  Speaker 1: call rusticles, made by microbes who live by eating iron.
• 1:11:42
  Speaker 1: If tanks or pipes still hold oil, it can seep
• 1:11:45
  Speaker 1: out for years like a wound that never closes. Yet
• 1:11:49
  Speaker 1: even these wounds become neighborhoods. Anemones colonize the rails. Sponges
• 1:11:55
  Speaker 1: grow where water speed is right. Small fish weave through
• 1:12:00
  Speaker 1: ladders and hatches. Big fish circle. The current finds edges
• 1:12:05
  Speaker 1: at last and throws black mussel seed against metal. They
• 1:12:09
  Speaker 1: stick and spread in dark carpets. Some wrecks become archives.
• 1:12:15
  Speaker 1: The cold preserves bottles, shoes, and the letters stamped in
• 1:12:19
  Speaker 1: brass plates. A century later, the name can still be
• 1:12:23
  Speaker 1: read by a curious diver. The wrecks are warnings, and
• 1:12:28
  Speaker 1: they are also cradles for new life, proofs. that the
• 1:12:32
  Speaker 1: sea adopts even our mistakes and gives them quiet use.
• 1:12:37
  Speaker 1: Between the wrecks pass iron travellers that do not sleep.
• 1:12:41
  Speaker 1: Early explorers rode spheres lowered by cable and watched the
• 1:12:46
  Speaker 1: deep through small ports with eyes that watered from cold.
• 1:12:51
  Speaker 1: Then came a vessel named for a rising star. In
• 1:12:55
  Speaker 1: the year 1960, a bathyscaphe descended to almost eleven kilometres
• 1:13:01
  Speaker 1: at the deepest point we know in the ocean. The
• 1:13:04
  Speaker 1: water pressed with a patience that would crush a mountain.
• 1:13:09
  Speaker 1: At the bottom the crew saw a plain of grey silt,
• 1:13:13
  Speaker 1: rippled by slow currents, and they saw a small fish
• 1:13:18
  Speaker 1: or an amphipod glide past. The message was simple, even
• 1:13:24
  Speaker 1: here there is life. The modern fleet is quieter and
• 1:13:28
  Speaker 1: more tireless. Gliders use a bladder to change their buoyancy
• 1:13:33
  Speaker 1: by a few spoonfuls of oil at a time. They
• 1:13:36
  Speaker 1: sink and rise in slow, sawtooth paths and convert those
• 1:13:41
  Speaker 1: gentle moves into forward motion using wings. A glider can
• 1:13:47
  Speaker 1: cross an ocean on the energy of a single light
• 1:13:51
  Speaker 1: bulb left burning for a few months. There are thousands
• 1:13:55
  Speaker 1: of free drifting floats that rise and fall through the
• 1:13:59
  Speaker 1: upper two kilometres and report the temperature and saltiness of
• 1:14:04
  Speaker 1: the water. They bring news of heat from storms and
• 1:14:08
  Speaker 1: of cold tongues of water sliding off the edges of continents.
• 1:14:13
  Speaker 1: There are tethered moorings that ring volcanic vents and listen
• 1:14:17
  Speaker 1: for tremors. There are robots shaped like birds, crabs, torpedoes,
• 1:14:23
  Speaker 1: and even flexible snakes that can creep into wrecks or
• 1:14:27
  Speaker 1: hover over fragile corals without a touch. The deep now
• 1:14:32
  Speaker 1: has patient scouts who never tire and who surface only
• 1:14:36
  Speaker 1: to tell us a little more. Humans also dive, drawn
• 1:14:41
  Speaker 1: by the wish to see with our own eyes. The
• 1:14:44
  Speaker 1: body answers with limits of its own. As we descend
• 1:14:48
  Speaker 1: breathing ordinary air, nitrogen enters the blood and the mind
• 1:14:52
  Speaker 1: grows soft and sweet. This is called narcosis by divers,
• 1:14:57
  Speaker 1: and it feels like a warm joke that slowly steals skill.
• 1:15:02
  Speaker 1: Oxygen itself becomes a stimulant and then a poison at
• 1:15:06
  Speaker 1: high pressure. To reach the depth where daylight fades entirely,
• 1:15:10
  Speaker 1: divers breathe mixes of helium and oxygen. or even add
• 1:15:15
  Speaker 1: a careful whisper of nitrogen to steady the mind. They
• 1:15:19
  Speaker 1: live in small chambers called habitats for days or weeks,
• 1:15:24
  Speaker 1: so that they need to decompress only once. Saturation diving
• 1:15:29
  Speaker 1: allows long work at depth. But it is engineering-matched to patience.
• 1:15:35
  Speaker 1: The ascent takes many hours as the body slowly gives
• 1:15:39
  Speaker 1: back the gases it gathered. Too fast a climb invites
• 1:15:43
  Speaker 1: bubbles within joints and nerves, a pain that is old
• 1:15:47
  Speaker 1: in the diving community and always respected. Records draw headlines.
• 1:15:55
  Speaker 1: A freediver descends along a line with one breath and
• 1:15:59
  Speaker 1: returns with a surface protocol recited like a short prayer.
• 1:16:03
  Speaker 1: A pair within a submersible touches the bottom of a
• 1:16:07
  Speaker 1: trench and returns with mud that looks like wet cement
• 1:16:11
  Speaker 1: but holds unheard stories. These records are interesting to the world,
• 1:16:17
  Speaker 1: but the deep teaches a different pride. Good expeditions return
• 1:16:22
  Speaker 1: quietly with careful notes and many samples still chilled. The
• 1:16:27
  Speaker 1: lesson is that attention is a better companion than bravery.
• 1:16:32
  Speaker 1: Even with robots and submersibles, the largest part of the
• 1:16:37
  Speaker 1: deep is still an outline. How do we draw a
• 1:16:40
  Speaker 1: map in the dark? The answer begins with echoes. A
• 1:16:45
  Speaker 1: ship sends a sound down like a firm knock on
• 1:16:48
  Speaker 1: a door and measures the time between the knock and
• 1:16:51
  Speaker 1: its return. If the ship carries a fan of transmitters,
• 1:16:55
  Speaker 1: it can paint a wide stripe beneath its track with
• 1:16:59
  Speaker 1: hundreds of narrow beams. The result is a multicoloured carpet
• 1:17:04
  Speaker 1: that shows hills and cuts in exquisite detail. But there
• 1:17:09
  Speaker 1: are wide places where ships have not passed. There the
• 1:17:13
  Speaker 1: map is painted by gravity. Under a mountain, even one
• 1:17:18
  Speaker 1: hidden by water, the sea surface bulges by a small
• 1:17:22
  Speaker 1: amount that sensitive instruments can feel. Satellites circle and measure
• 1:17:27
  Speaker 1: the height of the sea by bouncing microwave pulses off
• 1:17:31
  Speaker 1: the surface. The changes are small, a few centimetres, as
• 1:17:35
  Speaker 1: if a giant had pressed a wide finger into the water.
• 1:17:40
  Speaker 1: From these subtle clues, a map emerges. It is less
• 1:17:44
  Speaker 1: sharp than the echo map, but it reveals the big
• 1:17:48
  Speaker 1: bones of the planet and shows where to send the
• 1:17:52
  Speaker 1: ships that will later add fine lines and names. Within
• 1:17:57
  Speaker 1: the rooms, the maps reveal flow rivers that are not
• 1:18:01
  Speaker 1: rivers in the way we know them on land. A
• 1:18:04
  Speaker 1: river of cold, salty water forms in the far north.
• 1:18:08
  Speaker 1: When sea ice grows and pushes out salt, the brine
• 1:18:13
  Speaker 1: sinks and the new water begins a voyage around the world.
• 1:18:17
  Speaker 1: In the south, something equally grand happens along the edges
• 1:18:21
  Speaker 1: of Antarctica, where catabatic winds push young ice away from
• 1:18:26
  Speaker 1: the coast and leave open pools. In those pools, new
• 1:18:30
  Speaker 1: ice forms, and again, brine sinks. Overflow waters spill from
• 1:18:36
  Speaker 1: shelves like invisible cataracts, settle upon the bottom, and spread. Elsewhere,
• 1:18:42
  Speaker 1: the Mediterranean Sea sends a tongue of warm, salty water
• 1:18:47
  Speaker 1: westward through the narrow gate at Gibraltar. Heavy and quick,
• 1:18:52
  Speaker 1: it forms a layer that plunges and then rises again,
• 1:18:56
  Speaker 1: winding like smoke along the slope of the Atlantic basin
• 1:19:01
  Speaker 1: until it finally thins and blends. Eddies spin off these
• 1:19:06
  Speaker 1: currents like galaxies. Some are the size of small countries.
• 1:19:11
  Speaker 1: They live for months. Within them, the water has its
• 1:19:15
  Speaker 1: own temperature, its own saltiness, its own chemistry and life.
• 1:19:20
  Speaker 1: From space, they appear as rings of different colour, and
• 1:19:24
  Speaker 1: ships crossing them report sudden changes in wind and swell.
• 1:19:29
  Speaker 1: Inside the eddy, small creatures have a quiet holiday, feeding
• 1:19:34
  Speaker 1: and reproducing in a world whose edges keep outsiders at bay.
• 1:19:40
  Speaker 1: There are waves within the ocean that do not show
• 1:19:42
  Speaker 1: at the surface. They are called internal waves. They roll
• 1:19:48
  Speaker 1: along like draped sheets many tens of metres high, and
• 1:19:52
  Speaker 1: where they break they mix water from above and below,
• 1:19:56
  Speaker 1: loosening the tightness of layers and letting nutrients rise. Because
• 1:20:02
  Speaker 1: the deep holds these rivers and gyres and hidden waves,
• 1:20:06
  Speaker 1: it also holds climate. Heat from the surface does not
• 1:20:11
  Speaker 1: stop at the skin of the sea. In storms, the
• 1:20:14
  Speaker 1: wind stirs the upper layers and sends warmth downward. The
• 1:20:19
  Speaker 1: overturning circulation, slow and grand, delivers it further. Over the
• 1:20:25
  Speaker 1: last many decades, humans have added extra heat to the air,
• 1:20:30
  Speaker 1: and the ocean has taken most of it gently, like
• 1:20:33
  Speaker 1: a friend who removes a heavy coat from our shoulders.
• 1:20:38
  Speaker 1: The upper two kilometres now carry more warmth than they
• 1:20:42
  Speaker 1: did when our grandparents were young, and that heat spreads
• 1:20:46
  Speaker 1: outward and downward with the patience of water. Carbon dioxide
• 1:20:52
  Speaker 1: from our fires and engines dissolves into the sea as well.
• 1:20:57
  Speaker 1: Some of it is carried below by the sinking of
• 1:21:00
  Speaker 1: cold surface waters. Some is transformed by biology. Plankton breathe
• 1:21:06
  Speaker 1: in carbon dioxide and build skeletons and shells. When they die,
• 1:21:11
  Speaker 1: the shells sink and keep a record on the bottom.
• 1:21:15
  Speaker 1: Other creatures build soft bodies that fall and are eaten,
• 1:21:20
  Speaker 1: and the carbon is kept for a time in animals
• 1:21:23
  Speaker 1: and then in sediments. The deep is a bank that
• 1:21:26
  Speaker 1: stores both heat and carbon, not forever, but for years
• 1:21:31
  Speaker 1: to centuries. The storage buys time, which is a kind
• 1:21:35
  Speaker 1: of grace. But the bank is not without cost. Where
• 1:21:39
  Speaker 1: carbon dioxide dissolves, it makes carbonic acid and the water
• 1:21:43
  Speaker 1: becomes a little more sour. Shell builders in cold seas
• 1:21:48
  Speaker 1: feel this first. We owe them attention. The rules of
• 1:21:54
  Speaker 1: the deep world follow from energy. Food is rare, so
• 1:21:58
  Speaker 1: speed is expensive. Many deep inhabitants adopt slow living as
• 1:22:03
  Speaker 1: a law. Hearts beat fewer times in a minute. Muscles
• 1:22:07
  Speaker 1: carry more water and less tissue that costs energy to maintain.
• 1:22:12
  Speaker 1: Growth is measured in ring widths so small that you
• 1:22:16
  Speaker 1: need a microscope to see them. Lifetimes stretch from years
• 1:22:21
  Speaker 1: to decades and in some clams, perhaps, to centuries. Reproduction
• 1:22:26
  Speaker 1: is hedged against chance. Some animals release eggs and sperm
• 1:22:32
  Speaker 1: into the water in clouds so that sheer numbers help
• 1:22:36
  Speaker 1: a few meet. Others are hermaphrodites, ready to play either
• 1:22:40
  Speaker 1: part when a neighbour appears after a year without a neighbour.
• 1:22:45
  Speaker 1: Anglerfish use a strategy so strange that early biologists rejected
• 1:22:50
  Speaker 1: it as rumour. In the deep, many anglerfish species have
• 1:22:55
  Speaker 1: tiny males that find females by scent and then attach,
• 1:22:59
  Speaker 1: becoming permanent partners who share blood and supply sperm on demand.
• 1:23:05
  Speaker 1: Allure glowing from the head of the female acts as
• 1:23:09
  Speaker 1: a small lighthouse. It attracts prey and perhaps it draws
• 1:23:14
  Speaker 1: mates across the dim water. These solutions are careful mathematics
• 1:23:19
  Speaker 1: written in flesh. Where scarcity rules, size follows its own paths.
• 1:23:25
  Speaker 1: We met gentle giants among isopods and amphipods and squids.
• 1:23:31
  Speaker 1: The law is not a single line. In places where
• 1:23:34
  Speaker 1: predators are few, being large helps survive the long wait
• 1:23:38
  Speaker 1: between meals. In places where predators are many, being small
• 1:23:44
  Speaker 1: and clear is another answer. What looks like a contradiction
• 1:23:49
  Speaker 1: is instead a sign that many equations can solve the
• 1:23:53
  Speaker 1: problem of staying alive. There are forests of life that
• 1:23:57
  Speaker 1: share a single root. Siphonophores are one example. Corals are another.
• 1:24:03
  Speaker 1: Colonial animals allow parts to specialize. One part eats. One
• 1:24:08
  Speaker 1: part stings. One part makes babies. One part builds. The
• 1:24:13
  Speaker 1: colony is larger than the sum of its parts, and
• 1:24:17
  Speaker 1: lives longer than any single body should. A wise trick
• 1:24:22
  Speaker 1: in a place where meetings are rare. Our stories about
• 1:24:26
  Speaker 1: the deep used to glow with fear and longing. Sailors
• 1:24:30
  Speaker 1: told of creatures with arms like serpents who wrapped ships.
• 1:24:35
  Speaker 1: They spoke of dragons that breathed light and of sirens
• 1:24:39
  Speaker 1: that sang storms into being. The truth is kinder and
• 1:24:44
  Speaker 1: more complex. The kraken likely grew from real glimpses of
• 1:24:48
  Speaker 1: giant squids that float upward after dying and spread their
• 1:24:53
  Speaker 1: arms like a tangle of ropes. The sailors saw what
• 1:24:57
  Speaker 1: the sea allowed. Luminous dragons exist if you accept the
• 1:25:01
  Speaker 1: meaning of the words. A siphonophore many meters long drifts
• 1:25:06
  Speaker 1: with cascades of blue and green light pouring along its body.
• 1:25:11
  Speaker 1: Comb jellies carry plates that diffract light into rainbows. A
• 1:25:16
  Speaker 1: school of small fish can turn as one body that
• 1:25:20
  Speaker 1: flashes and then vanishes, and it looks exactly like magic.
• 1:25:26
  Speaker 1: There are milky seas that at first sound like rumour.
• 1:25:30
  Speaker 1: Whole horizons can glow with a faint uniform light on
• 1:25:34
  Speaker 1: windless nights in warm waters. Satellites have now watched these
• 1:25:39
  Speaker 1: events from above. and ships have sailed through them. The
• 1:25:44
  Speaker 1: cause seems to be dense fields of luminous bacteria that
• 1:25:49
  Speaker 1: release light in a quiet chorus. The famous bloop, a
• 1:25:53
  Speaker 1: low sound recorded in the late 1990s, turned out to
• 1:25:58
  Speaker 1: be the noise of ice rather than a beast. The
• 1:26:02
  Speaker 1: call of a blue whale can be mistaken for the
• 1:26:05
  Speaker 1: deep background hum of the planet if you do not
• 1:26:09
  Speaker 1: know how to listen. Mermaids soften into reality as stories
• 1:26:14
  Speaker 1: of manatees seen through heat haze and wishful hearts. The
• 1:26:19
  Speaker 1: fictions are not failures. They are bridges from a human
• 1:26:23
  Speaker 1: mind to a sea that is too large for any
• 1:26:27
  Speaker 1: single truth. As science draws better maps, the wonder remains.
• 1:26:33
  Speaker 1: The sea keeps its dragons, but now we can name
• 1:26:36
  Speaker 1: them gently and describe their diets. The light above us
• 1:26:43
  Speaker 1: has been patient for a long while. It is time
• 1:26:46
  Speaker 1: to rise. Imagine our glider pointing its nose toward the surface.
• 1:26:51
  Speaker 1: The water that presses lightly against its wings has travelled
• 1:26:56
  Speaker 1: from a polar shelf, where young ice was born, and
• 1:27:00
  Speaker 1: from a tropical rainstorm where a river met salt. On
• 1:27:04
  Speaker 1: the way up, we pass through jellies that pulse without hurry.
• 1:27:09
  Speaker 1: through a cloud of plankton that sink again by morning,
• 1:27:14
  Speaker 1: through the private circle of an eddy that was born
• 1:27:17
  Speaker 1: last season and will die in the next. We glide
• 1:27:22
  Speaker 1: past a ruined ship that has become a palace for
• 1:27:25
  Speaker 1: anemones and a school for juvenile fish. The hull carries
• 1:27:30
  Speaker 1: the marks of welders who built it when radios had
• 1:27:33
  Speaker 1: glowing tubes and music, was carried by needles and grooves.
• 1:27:40
  Speaker 1: Rust eats the letters, but we can still guess the name.
• 1:27:45
  Speaker 1: The sea light brightens from blue to pale green, and
• 1:27:49
  Speaker 1: then to gold. Above us, the first white teeth of
• 1:27:52
  Speaker 1: a wave grin and pass. The glider surfaces and sends
• 1:27:57
  Speaker 1: a message into the sky. A satellite hears. Onshore, a
• 1:28:01
  Speaker 1: line of numbers becomes a small, clean graph. A scientist
• 1:28:06
  Speaker 1: smiles and files it into a curve that will one
• 1:28:09
  Speaker 1: day describe a decade. Our own ship rises with less
• 1:28:13
  Speaker 1: grace but with equal gratitude. The ladder is warm from sun,
• 1:28:18
  Speaker 1: the air smells of salt and wood, and the faint
• 1:28:22
  Speaker 1: oil of machines that have worked without complaint for a
• 1:28:26
  Speaker 1: long day. Before we close our notebook, let us hold
• 1:28:31
  Speaker 1: the images once more. Plastic shavings that drift like frost
• 1:28:36
  Speaker 1: and then settle into a silent archive that the sea
• 1:28:40
  Speaker 1: edits slowly, wrecks that rust and yet host gardens. Iron
• 1:28:45
  Speaker 1: travellers that listen with patience and call home when the
• 1:28:49
  Speaker 1: sky is clear. Divers who learn the chemistry of breath
• 1:28:53
  Speaker 1: and the slow arithmetic of ascent. Maps drawn from echoes
• 1:28:58
  Speaker 1: and from the way the sea bulges above hidden mountains.
• 1:29:03
  Speaker 1: Rivers of dense water falling without spray and eddies that
• 1:29:08
  Speaker 1: are small worlds with edges. Heat and carbon held with
• 1:29:12
  Speaker 1: care in deep rooms while the surface decides its next weather.
• 1:29:17
  Speaker 1: Laws of slow living that trade speed for long life
• 1:29:21
  Speaker 1: and risk for gentle insurance. Dragons that turn out to
• 1:29:26
  Speaker 1: be colonies and combs and squids, all no less wonderful
• 1:29:31
  Speaker 1: for being real. The sea is not a stranger. It
• 1:29:35
  Speaker 1: is the oldest room of the planet where salt keeps time.
• 1:29:40
  Speaker 1: It is careful with its guests. It wastes little and
• 1:29:44
  Speaker 1: remembers much. The deep is the quiet library under the
• 1:29:48
  Speaker 1: bright market of waves, a place where every shelf is
• 1:29:52
  Speaker 1: water and every book is written in motion and chemistry
• 1:29:57
  Speaker 1: and light. As you settle now into your own night,
• 1:30:01
  Speaker 1: imagine a small bell jelly drifting with a rhythm that
• 1:30:05
  Speaker 1: matches your breath. Imagine a coral forest in darkness lifting
• 1:30:11
  Speaker 1: its tiny hands to catch a little more food. Imagine
• 1:30:15
  Speaker 1: a vent chimney pouring black glitter into the cold where
• 1:30:19
  Speaker 1: worms stand in red crowds like a soft choir. The
• 1:30:23
  Speaker 1: surface will be here in the morning, ready with its
• 1:30:27
  Speaker 1: gulls and its sun. The bottom will keep watch in
• 1:30:33
  Speaker 1: the dark, and nothing important will be lost. Why are
• 1:30:38
  Speaker 1: the deep places of the ocean still not fully explored,
• 1:30:43
  Speaker 1: and what could be waiting in that unvisited dark? The
• 1:30:47
  Speaker 1: answer begins with size and time. The ocean covers more
• 1:30:51
  Speaker 1: than two-thirds of the planet, and it is not only wide,
• 1:30:56
  Speaker 1: it is deep in a way that escapes ordinary experience.
• 1:31:02
  Speaker 1: If you were to stand on the shore and stretch
• 1:31:04
  Speaker 1: your arm, your hand would touch air that thins gently
• 1:31:09
  Speaker 1: with height. Water does the opposite. With every ten meters
• 1:31:13
  Speaker 1: of descent, the pressure grows by roughly one atmosphere. So
• 1:31:19
  Speaker 1: by the time you enter trenches at nearly 11,000 meters,
• 1:31:23
  Speaker 1: the weight is like a mountain that presses from all
• 1:31:27
  Speaker 1: directions at once. Materials that are strong on land become
• 1:31:32
  Speaker 1: tired and brittle there. Light fails within the first few
• 1:31:37
  Speaker 1: hundred meters. Radio waves that carry voices in air cannot
• 1:31:42
  Speaker 1: travel far in salt water. The deep is not hostile
• 1:31:46
  Speaker 1: in the sense of anger. It is simply a patient
• 1:31:49
  Speaker 1: world with different rules. These rules make exploration difficult even now.
• 1:31:56
  Speaker 1: Ships that map the bottom with echoes paint only narrow
• 1:32:00
  Speaker 1: paths at a time. A modern vessel tracing a careful
• 1:32:04
  Speaker 1: grid can spend weeks or months on a single square
• 1:32:09
  Speaker 1: of sea and still leave smaller features untouched. Satellites help
• 1:32:13
  Speaker 1: by measuring tiny bulges and dips on the surface to
• 1:32:17
  Speaker 1: guess the mass hidden below, but those guesses need ships
• 1:32:22
  Speaker 1: to add fine lines later, and ships cost money, crews
• 1:32:26
  Speaker 1: need rest, weather breaks plans, and the ocean draws long
• 1:32:30
  Speaker 1: distances between refuel points. Every expedition is a small moving
• 1:32:36
  Speaker 1: town with constant needs. Communication is another slow gate. Sound
• 1:32:42
  Speaker 1: travels far in water, but the information you can send
• 1:32:46
  Speaker 1: with sound is small and the messages are slow. The
• 1:32:50
  Speaker 1: deep web is not like the air where wireless signals
• 1:32:54
  Speaker 1: whisper through walls. A robot that wants to send pictures
• 1:32:59
  Speaker 1: and large data files must rise to the surface or
• 1:33:03
  Speaker 1: find a cable. A vehicle that is tethered by a
• 1:33:07
  Speaker 1: cable can stream its vision to the ship. But now
• 1:33:11
  Speaker 1: the team must guard that long lifeline against rocks and
• 1:33:15
  Speaker 1: currents and tangles. In the shallows, a diver becomes the
• 1:33:20
  Speaker 1: brain and the hands at once. In the deep, thinking
• 1:33:24
  Speaker 1: and doing are separated by thick water and long seconds.
• 1:33:29
  Speaker 1: You ask a machine to turn, and then you wait
• 1:33:32
  Speaker 1: for the reply that says it turned. Fragility also slows
• 1:33:37
  Speaker 1: us on purpose. Deep communities recover slowly from disturbance. A
• 1:33:43
  Speaker 1: coral branch that took a century to grow can break
• 1:33:47
  Speaker 1: with the brush of a heavy fin. The sediment that
• 1:33:50
  Speaker 1: a careless thruster kicks up can take hours to fall,
• 1:33:55
  Speaker 1: and in those hours a whole scene is hidden behind
• 1:33:59
  Speaker 1: a soft blizzard. Ethical explorers move as if in a
• 1:34:03
  Speaker 1: museum at night, Careful with light, careful with breath, careful
• 1:34:08
  Speaker 1: with speed. That kind of patience is a virtue and
• 1:34:12
  Speaker 1: also a practical limit. You cannot hurry and still be
• 1:34:17
  Speaker 1: kind to a world that cannot replace what you harm.
• 1:34:21
  Speaker 1: There are human boundaries as well. The high seas belong
• 1:34:25
  Speaker 1: to everyone and to no one at once. Permits, insurance
• 1:34:30
  Speaker 1: and international agreements guide what can be collected and where
• 1:34:35
  Speaker 1: machines can touch bottom. These guardrails are necessary and good,
• 1:34:41
  Speaker 1: but they add steps and months to the timeline. On
• 1:34:44
  Speaker 1: the scientific side, the river of samples itself is a challenge.
• 1:34:49
  Speaker 1: Bringing a bag of mud to a deck is the beginning,
• 1:34:53
  Speaker 1: not the end. Each scoop holds thousands of species of microbes,
• 1:34:58
  Speaker 1: dozens of small animals, and a library of chemical information.
• 1:35:04
  Speaker 1: It can take a team months to extract the first
• 1:35:07
  Speaker 1: few stories and years to finish the reading. The deep
• 1:35:12
  Speaker 1: is a patient library. The librarians on deck must be
• 1:35:16
  Speaker 1: patient too. Energy slows us. A glider can cross an
• 1:35:21
  Speaker 1: ocean on the power that a light bulb would sip
• 1:35:24
  Speaker 1: for a season, but that frugality limits how many pictures
• 1:35:28
  Speaker 1: it can take and how quickly it can change direction.
• 1:35:32
  Speaker 1: Batteries are better now than in the days when the
• 1:35:35
  Speaker 1: first floats drifted with paper labels, but a thousand kilometers
• 1:35:40
  Speaker 1: is still a long way when you must return to
• 1:35:43
  Speaker 1: a ship for new power. Engineers dream of charging stations
• 1:35:48
  Speaker 1: that rise from the seabed when called, of cables that
• 1:35:51
  Speaker 1: run like quiet roots to vent fields for heat, of
• 1:35:56
  Speaker 1: surface solar stations with tethers that lower power in the
• 1:36:00
  Speaker 1: calm of night. Those dreams are slowly entering the real sea,
• 1:36:05
  Speaker 1: but the sea allows new plans only to at the
• 1:36:09
  Speaker 1: pace of weather windows, budgets, and small successes. All of
• 1:36:15
  Speaker 1: this explains why we do not yet have a complete
• 1:36:19
  Speaker 1: map and a complete catalogue. What then might be waiting
• 1:36:24
  Speaker 1: in that wide remaining dark? The most honest answer is
• 1:36:28
  Speaker 1: that the sea will surprise us with both the small
• 1:36:33
  Speaker 1: and the large. Consider life first. There are entire families
• 1:36:40
  Speaker 1: of microbes that we know only by their genetic signatures.
• 1:36:44
  Speaker 1: A spoon of deep water holds cells that breathe by
• 1:36:48
  Speaker 1: using sulfur or iron or methane in ways that were
• 1:36:52
  Speaker 1: guessed only a few decades ago. On certain rocks, invisible
• 1:36:57
  Speaker 1: films make minerals grow like frost. In other places, those
• 1:37:03
  Speaker 1: films dissolve rock and release elements that feed plankton high above.
• 1:37:08
  Speaker 1: Microbes build tiny cities on plastic bits that drift for years.
• 1:37:13
  Speaker 1: They modify the chemistry around them and become unintentional markers
• 1:37:18
  Speaker 1: of our age. New enzymes hide in those films, ways
• 1:37:22
  Speaker 1: of chewing complex molecules that could one day help clean
• 1:37:26
  Speaker 1: polluted waters or drive gentle industry on land. The sub-seafloor
• 1:37:32
  Speaker 1: biosphere extends kilometers into the crust in the form of
• 1:37:37
  Speaker 1: slow cells that divide perhaps only once in a decade
• 1:37:41
  Speaker 1: to stand on deck with a core of warm black
• 1:37:45
  Speaker 1: basalt in your hands and to know that it holds
• 1:37:48
  Speaker 1: a living community that has never seen the sun is
• 1:37:52
  Speaker 1: to feel very small and very glad at once. Within
• 1:37:57
  Speaker 1: the realm of animals, the list of missing characters is
• 1:38:01
  Speaker 1: surely long. Each year brings news of soft-bodied fishes with
• 1:38:06
  Speaker 1: faces that look thoughtful, of shrimps that carry light organs
• 1:38:11
  Speaker 1: like lanterns on a festival night, of worms that wear
• 1:38:15
  Speaker 1: feathery crowns and drink chemical energy from vents. A few
• 1:38:20
  Speaker 1: years ago a siphonophore was filmed that was longer than
• 1:38:24
  Speaker 1: a city bus by many times, coiled like a glowing wreath.
• 1:38:29
  Speaker 1: It was not a single creature but a colony where
• 1:38:33
  Speaker 1: each member had a role. More are out there, some
• 1:38:37
  Speaker 1: big and ribbon-like, some small and neat as watch parts,
• 1:38:42
  Speaker 1: each with a novel answer to the quiet math of
• 1:38:45
  Speaker 1: deep living. It is tempting to imagine monstrous giants that
• 1:38:50
  Speaker 1: would challenge a ship, but truth prefers elegance over fright.
• 1:38:55
  Speaker 1: The giant squid and the colossal squid are real and majestic,
• 1:39:01
  Speaker 1: each with eyes the size of dinner plates, to catch
• 1:39:04
  Speaker 1: flecks of light. They are not hunters of ships. They
• 1:39:09
  Speaker 1: are sophisticated, long-armed specialists in ambush and escape. Their lives
• 1:39:15
  Speaker 1: are still mostly unknown. We may learn one day that
• 1:39:20
  Speaker 1: their migration routes stretch farther than we guessed, and that
• 1:39:25
  Speaker 1: their spawning grounds lie in places we have not yet sounded.
• 1:39:29
  Speaker 1: There may be fish of great length that live along
• 1:39:33
  Speaker 1: the edges of internal waves and feed in the changing flow.
• 1:39:38
  Speaker 1: There may be octopuses that farm gardens of shell and sponge.
• 1:39:44
  Speaker 1: There will certainly be tiny predators with jaws that fold
• 1:39:49
  Speaker 1: like pocket knives and open in a blink. When cameras
• 1:39:53
  Speaker 1: ride on drifting platforms that are quiet and patient for
• 1:39:57
  Speaker 1: months without light, they see eyes that glide past like
• 1:40:01
  Speaker 1: small moons and never return to the same frame again.
• 1:40:06
  Speaker 1: The deep has many citizens of whom we may gain
• 1:40:10
  Speaker 1: only a fleeting glimpse. Ecosystems we do not yet grasp
• 1:40:14
  Speaker 1: likely wait at unusual chemical scenes. Brine pools in the
• 1:40:19
  Speaker 1: Gulf of Mexico that hold ancient salt under newer water
• 1:40:24
  Speaker 1: host mussels and tube worms at their edges, and the
• 1:40:27
  Speaker 1: pools themselves are clear as glass and deadly to an
• 1:40:32
  Speaker 1: unprotected fish. There are likely brine lakes along other continental
• 1:40:37
  Speaker 1: margins as well, each with its own chemistry and its
• 1:40:42
  Speaker 1: own communities. Wood falls and kelp falls that drop from
• 1:40:47
  Speaker 1: forests and coasts to the bottom become dining halls where
• 1:40:51
  Speaker 1: strange snails and clams appear that we have yet to name.
• 1:40:56
  Speaker 1: Even fields of manganese nodules, which look so inert and
• 1:41:00
  Speaker 1: so dull, hold animals that prefer their hard surfaces to
• 1:41:05
  Speaker 1: the surrounding mud. The global conversation about mining those nodules
• 1:41:11
  Speaker 1: is not only about metals. It is also about the
• 1:41:14
  Speaker 1: life that uses their copper and cobalt and iron not
• 1:41:19
  Speaker 1: as ore but as shelter. Geology still keeps secrets. Thousands
• 1:41:25
  Speaker 1: of seamounts have never been mapped or visited. Some will
• 1:41:29
  Speaker 1: hold cold water corals that are centuries old. Others will
• 1:41:33
  Speaker 1: host vent fields where superheated water pours through chimneys that
• 1:41:38
  Speaker 1: grow faster than a tree. In certain fields, the water
• 1:41:43
  Speaker 1: becomes so hot and so pressurized that it turns into
• 1:41:47
  Speaker 1: a supercritical fluid, neither liquid nor gas. and its capacity
• 1:41:53
  Speaker 1: to dissolve metals is extraordinary. The chimneys that form there
• 1:41:58
  Speaker 1: are like cathedrals plated in copper and zinc and gold.
• 1:42:03
  Speaker 1: They rise and collapse and rise again as the hidden
• 1:42:07
  Speaker 1: plumbing shifts. To walk a camera along those colonnades is
• 1:42:11
  Speaker 1: to feel that you are seeing the planet when it
• 1:42:14
  Speaker 1: was young. Archaeology in the sea is only beginning to
• 1:42:19
  Speaker 1: stretch its arms. When the last ice age ended and
• 1:42:24
  Speaker 1: oceans rose by more than 100 metres over many thousands
• 1:42:28
  Speaker 1: of years, the coasts where early people camped and worked
• 1:42:33
  Speaker 1: moved inland. Their old shorelines are now underwater, off Australia
• 1:42:39
  Speaker 1: and off Northern Europe, Teams are finding stone tools on
• 1:42:43
  Speaker 1: the seabed where rivers once flowed across plains. Caves that
• 1:42:48
  Speaker 1: were once dry and held paintings or burials now lie
• 1:42:53
  Speaker 1: behind curtains of salt water and stalactites. A careful diver
• 1:43:00
  Speaker 1: with a soft brush becomes a quiet historian of families
• 1:43:04
  Speaker 1: who watch the sea from a very different beach. In
• 1:43:08
  Speaker 1: the realm of physics, there are questions as well. The
• 1:43:11
  Speaker 1: largest internal waves can break and stir waters that were
• 1:43:16
  Speaker 1: meant to stay separate. That mixing changes how nutrients rise
• 1:43:21
  Speaker 1: to feed plankton and how heat travels to shallower layers.
• 1:43:26
  Speaker 1: The landscape of eddies, which is a moving mosaic of
• 1:43:30
  Speaker 1: circles and arcs, may have stable places where animals learn
• 1:43:35
  Speaker 1: to meet again and again. like crossroads in a dark town.
• 1:43:41
  Speaker 1: The soundscape of the deep is a layered composition of
• 1:43:44
  Speaker 1: earthquakes far away, surf carried through the seabed as a
• 1:43:49
  Speaker 1: long trembling calling wails, crackling ice, and the gentle hiss
• 1:43:54
  Speaker 1: of bubbles that break from cold seeps and dissolve on
• 1:43:58
  Speaker 1: the way up. We have only begun to record this
• 1:44:02
  Speaker 1: music in enough places and for enough seasons to write
• 1:44:07
  Speaker 1: its score. What keeps all this hidden is not malice
• 1:44:12
  Speaker 1: and not even mystery for its own sake. It is
• 1:44:16
  Speaker 1: distance and pressure and time. But there is a gentle
• 1:44:20
  Speaker 1: revolution underway. Tools are getting smaller and cheaper. A single
• 1:44:25
  Speaker 1: ship can deploy a family of vehicles that dive at once,
• 1:44:29
  Speaker 1: some staying near the bottom like careful crabs, others gliding
• 1:44:34
  Speaker 1: high and slow like patient birds. Environmental DNA sampling lets
• 1:44:40
  Speaker 1: a team collect a bottle of water and read the
• 1:44:43
  Speaker 1: invisible traces of who passed through in the last few days.
• 1:44:49
  Speaker 1: Machine learning helps cameras find the outline of a shrimp
• 1:44:53
  Speaker 1: or a fish in dim light and suggest what to
• 1:44:56
  Speaker 1: photograph next. Open data lets a child in a city
• 1:45:01
  Speaker 1: far from the coast Help a scientist classify strange shapes.
• 1:45:06
  Speaker 1: International projects are knitting maps from thousands of tracks into
• 1:45:11
  Speaker 1: one living atlas that updates itself with each crossing. None
• 1:45:16
  Speaker 1: of this rushes the sea. It simply means that we
• 1:45:20
  Speaker 1: are learning to listen better. What, then, should we expect?
• 1:45:25
  Speaker 1: And how should we go? Expect to be surprised by
• 1:45:29
  Speaker 1: the ordinary. Expect that a new species will look like
• 1:45:33
  Speaker 1: a clear ribbon at first and only later reveal a
• 1:45:37
  Speaker 1: clever life. Expect that a lump of mineral will hold
• 1:45:41
  Speaker 1: a city of microbes more interesting than the mineral itself.
• 1:45:46
  Speaker 1: Expect that the most important record you collect might be
• 1:45:51
  Speaker 1: a string of temperatures through a winter storm rather than
• 1:45:55
  Speaker 1: a charismatic photograph. Expect that a very old community will
• 1:46:02
  Speaker 1: ask you to move slowly, and that moving slowly will
• 1:46:06
  Speaker 1: be the best way to see. How should we go
• 1:46:10
  Speaker 1: with a museum walk with a plan to leave no trash?
• 1:46:15
  Speaker 1: with a promise to share the map you made and
• 1:46:18
  Speaker 1: the code that ran your robot so that the next
• 1:46:21
  Speaker 1: team can save time, with respect for local knowledge from
• 1:46:26
  Speaker 1: fishers and sailors who have watched certain curves in the
• 1:46:31
  Speaker 1: water for a lifetime, with careful curiosity about how exploration
• 1:46:36
  Speaker 1: and extraction are different words and different paths. with the
• 1:46:41
  Speaker 1: calm understanding that a world that takes centuries to build
• 1:46:46
  Speaker 1: a forest will not be impressed by a quick harvest.
• 1:46:51
  Speaker 1: In the end, the deep is not empty space waiting
• 1:46:55
  Speaker 1: for us to fill it with meaning. It is already full.
• 1:46:59
  Speaker 1: It holds the slow engines of climate, the patient storehouses
• 1:47:04
  Speaker 1: of carbon and heat, the recipes of minerals, and the
• 1:47:09
  Speaker 1: longer stories of life written by animals that live at
• 1:47:13
  Speaker 1: the pace of cold time. It contains a library of
• 1:47:17
  Speaker 1: forms that remind us the universe enjoys making many answers
• 1:47:22
  Speaker 1: to the same problem. It holds future medicines and new
• 1:47:26
  Speaker 1: ideas for materials and quiet reminders about patience. It teaches
• 1:47:33
  Speaker 1: that worlds can be strong without noise. that communities can
• 1:47:37
  Speaker 1: be rich even when sparse, and that light is only
• 1:47:41
  Speaker 1: one way to run a planet. As you let your
• 1:47:44
  Speaker 1: thoughts lift toward rest, imagine a last scene. A small
• 1:47:49
  Speaker 1: autonomous glider hums a steady note, checks its sensors, and
• 1:47:54
  Speaker 1: turns toward the surface. Far below, a pale coral forest
• 1:47:59
  Speaker 1: on a long slope continues to feed as it has
• 1:48:02
  Speaker 1: for centuries. In mid-water, a school of lantern fish finishes
• 1:48:07
  Speaker 1: its nightly climb and begins its slow descent, each fish
• 1:48:12
  Speaker 1: a tiny star with a timetable as precise as an astronomer,
• 1:48:17
  Speaker 1: near a seep a snail with iron scales. scrapes a
• 1:48:21
  Speaker 1: quiet living from chemistry. On a distant ridge a young
• 1:48:25
  Speaker 1: chimney grows by a fingertip in an hour as hot
• 1:48:29
  Speaker 1: water continues to rise from rock creating rooms for worms
• 1:48:33
  Speaker 1: and shrimp and crabs. Above all of this the first
• 1:48:37
  Speaker 1: light of morning folds into the topmost meters, where kelp
• 1:48:43
  Speaker 1: sway and gulls cry. We will not see every chamber
• 1:48:48
  Speaker 1: of this underwater city in our own lives. That is
• 1:48:52
  Speaker 1: all right. The sea is good at being old. The
• 1:48:55
  Speaker 1: important part is to walk with care, to study with kindness,
• 1:49:00
  Speaker 1: and to tell the stories we do find with accuracy
• 1:49:04
  Speaker 1: and respect. Thank you for keeping company through this slow voyage.
• 1:49:10
  Speaker 1: May the memory of the deep rest beside you like
• 1:49:13
  Speaker 1: a calm tide and may your sleep be as steady
• 1:49:17
  Speaker 1: as a lighthouse beam that turns without hurry. Good night.