Latest / Space Exploration Stories / The valve that opened in descent and bled their air before landing
Transcript
- 0:04Speaker 1: On June 30, 1971, a Soviet search and rescue team
- 0:09Speaker 1: approached the Soyuz 11 capsule on the steppes of Kazakhstan.
- 0:14Speaker 1: The parachutes had deployed perfectly. The retrorikach had fired on schedule.
- 0:19Speaker 1: The capsule sat upright in the grass, exactly where mission
- 0:22Speaker 1: controllers had calculated it would land. One of the recovery
- 0:26Speaker 1: crew knocked on the outer hull. There was no response
- 0:29Speaker 1: from within. Every automatic system had performed exactly as designed.
- 0:34Speaker 1: The navigation had been flawless. The re-entry trajectory matched the
- 0:38Speaker 1: flight plan to within acceptable margins. From the outside, this
- 0:42Speaker 1: was a textbook mission conclusion. The men inside had been
- 0:45Speaker 1: in space for 23 days, a world record at the time.
- 0:50Speaker 1: The world was waiting to celebrate them. The hatch opened.
- 0:54Speaker 1: Georgi Dobrovolsky, Vladislav Vokov, and Viktor Patsaev were sitting in
- 0:59Speaker 1: their seats, still strapped in, in the correct positions for landing.
- 1:04Speaker 1: They looked, to the first rescuers on scene. Like men
- 1:08Speaker 1: who had simply fallen asleep, none of them was breathing.
- 1:11Speaker 1: All three were already dead. The capsule had landed in
- 1:15Speaker 1: the right place at the right time, with the right
- 1:18Speaker 1: three crewmen. Everything the mission required of the machine, the
- 1:22Speaker 1: machine had delivered. What it had not delivered was air.
- 1:25Speaker 1: Somewhere between the moment the crew sealed their hatch in
- 1:28Speaker 1: orbit and the moment that recovery team knocked on the
- 1:31Speaker 1: hull over Kazakhstan, the atmosphere inside Soyuz 11 had bled
- 1:35Speaker 1: out into space. The three men died, not in an explosion,
- 1:39Speaker 1: not in a fire, not in a collision. They died
- 1:43Speaker 1: in silence, in the dark, at an altitude where no
- 1:47Speaker 1: one could reach them, in a spacecraft that was working perfectly.
- 1:51Speaker 1: These are the only three human beings in history to
- 1:54Speaker 1: have died in space, above the Kármán line, the boundary,
- 1:58Speaker 1: where Earth's atmosphere ends and space begins. No one else
- 2:02Speaker 1: has ever died there, and for nearly two years after
- 2:05Speaker 1: that morning in Kazakhstan, the Soviet government did not tell
- 2:09Speaker 1: the world how it had happened. The warning signs were
- 2:11Speaker 1: already visible before the mission launched, and the men who
- 2:14Speaker 1: built the spacecraft that killed these three cosmonauts already knew,
- 2:19Speaker 1: in principle, exactly what could happen. To understand what killed
- 2:23Speaker 1: the crew of Soyuz 11, it is necessary to understand
- 2:27Speaker 1: what sent them there in the first place, and who
- 2:30Speaker 1: almost went instead. The mission was Soyuz 11. Its destination
- 2:35Speaker 1: was Salyut 1, the world's first space station. Launched into
- 2:39Speaker 1: orbit on April 19, 1971, the Soviet space program intended
- 2:45Speaker 1: to dock a crew with Salyut 1 live and work
- 2:48Speaker 1: aboard the station for an extended period and demonstrate to
- 2:51Speaker 1: the world and to the Americans that Soviet cosmonauts could
- 2:55Speaker 1: survive and function in prolonged weightlessness. The first crew sent
- 3:00Speaker 1: to accomplish this The prime crew for Soyuz 10 had
- 3:03Speaker 1: failed to complete a successful docking in April. So a
- 3:07Speaker 1: new mission was prepared. A new crew was named. Alexei Leonov,
- 3:12Speaker 1: the man who had performed the world's first spacewalk six
- 3:16Speaker 1: years earlier, was named commander of the prime crew for
- 3:20Speaker 1: Soyuz 11. His crew included Valery Kubasov as flight engineer
- 3:25Speaker 1: and Pyotr Kolodin as research engineer. Four days before launch,
- 3:30Speaker 1: A routine medical examination flagged Kubasov. A chest x-ray showed
- 3:35Speaker 1: a shadow on his lung. The flight surgeons suspected tuberculosis.
- 3:40Speaker 1: It was not perbucculosis. The finding was later determined to
- 3:44Speaker 1: be an allergic reaction to a pesticide used near the
- 3:47Speaker 1: cosmonaut's training facility. But in 1971, with four days remaining
- 3:53Speaker 1: before the launch window, the doctors could not confirm that.
- 3:57Speaker 1: And so Leonov's entire prime crew was removed from the mission.
- 4:01Speaker 1: The backup crew stepped in. Commander Georgi Dobrovolsky, flight engineer
- 4:07Speaker 1: Vladislav Volkov, and research engineer Viktor Patsaev would fly Soyuz
- 4:13Speaker 1: 11 instead. They had not expected to fly. None of
- 4:16Speaker 1: them had commanded a long-duration mission before. Dobrovolsky was 43
- 4:21Speaker 1: years old. Patsaev was 38. Volkov, at 35, was the
- 4:26Speaker 1: youngest of the three. What made the substitution significant was
- 4:31Speaker 1: not just its timing, it was the capsule they were
- 4:33Speaker 1: flying in. Soyuz 11, like all Soyuz spacecraft of that era,
- 4:38Speaker 1: had originally been designed to carry three cosmonauts in pressure suits,
- 4:42Speaker 1: suits that would protect them if the cabin lost pressure.
- 4:45Speaker 1: But the interior had been reconfigured to fit three people.
- 4:49Speaker 1: The suit support systems had been removed. On Soyuz 11,
- 4:54Speaker 1: the crew flew without pressure suits. There was no individual
- 4:57Speaker 1: life support backup if the cabin atmosphere failed. This was
- 5:01Speaker 1: a known engineering compromise. The logic was straightforward. If the
- 5:05Speaker 1: spacecraft's pressure integrity held, the suits were unnecessary weight. The
- 5:10Speaker 1: mission designers accepted the trade-off. Alexei Leonov, who had been
- 5:15Speaker 1: removed from the mission with his crew, later said he
- 5:18Speaker 1: had not trusted the pressure valves to close automatically in
- 5:21Speaker 1: an emergency. He had raised the concern. The concern was noted.
- 5:25Speaker 1: The mission proceeded. The crew docked successfully with Salyut 1
- 5:30Speaker 1: on June 7th. They spent 23 days and 18 hours
- 5:34Speaker 1: aboard the station, conducting scientific experiments, performing observations, setting the
- 5:40Speaker 1: world record for time in space. By all accounts, the
- 5:43Speaker 1: mission was proceeding well. On June 29th, they undocked and
- 5:48Speaker 1: prepared for re-entry. What no one on the ground knew,
- 5:52Speaker 1: as Soyuz 11 began its descent, was that something had
- 5:55Speaker 1: already gone wrong aboard the spacecraft. The crew had gone
- 5:59Speaker 1: quiet early, before the scheduled communications blackout. The silence arrived early.
- 6:05Speaker 1: At the time, no one on the ground registered it
- 6:07Speaker 1: as significant. Reentry blackouts were normal. A few minutes of
- 6:11Speaker 1: silence before the blackout was unusual, but not immediately alarming.
- 6:16Speaker 1: The recovery teams waited at the landing site. The parachutes
- 6:20Speaker 1: opened on schedule. The retro rockets fired. The capsule touched
- 6:24Speaker 1: down in Kazakhstan, and the knock on the hull went unanswered.
- 6:28Speaker 1: When the recovery team opened the hatch, the first thing
- 6:31Speaker 1: they noticed was the color. Georgi Dobrovolsky, Vladislav Volkov, and
- 6:36Speaker 1: Viktor Patsyov were seated in their positions, seatbelts fastened. No
- 6:41Speaker 1: visible trauma, but their skin had taken on a bluish cast,
- 6:44Speaker 1: and there were dark traces around their noses and mouths.
- 6:48Speaker 1: The medical staff began CPR immediately. They kept working. They
- 6:52Speaker 1: did not stop for a long time. Nobody on the
- 6:55Speaker 1: ground knew what had killed them. That is the part
- 6:58Speaker 1: that stays with you. Doctors pressing on the chests of
- 7:01Speaker 1: men who had been dead for more than 30 minutes
- 7:03Speaker 1: performing the correct procedure for the wrong emergency, because nothing
- 7:07Speaker 1: in the capsule told them what had actually happened inside it.
- 7:11Speaker 1: The instruments had recorded a normal descent. The parachutes, the retrocaches,
- 7:16Speaker 1: the landing sequence, all nominal. Whatever had gone wrong before
- 7:20Speaker 1: any of that, and it had left no mark on
- 7:23Speaker 1: the spacecraft. That question what exactly failed, and when, would
- 7:28Speaker 1: take investigators weeks to reconstruct. The answer, when it came,
- 7:33Speaker 1: turned on a single bolt. Soyuz 11 had two orbital
- 7:36Speaker 1: modules joined together. The descent capsule, where the crew sat
- 7:40Speaker 1: during re-entry in the work compartment, where they lived and
- 7:43Speaker 1: operated during the mission. Before re-entry, the two had to separate,
- 7:47Speaker 1: That separation was triggered by a set of pyrotechnic bolts,
- 7:51Speaker 1: small explosive charges that fired simultaneously to release the modules cleanly.
- 7:57Speaker 1: On June 29th, the bolts fired. They were designed to
- 8:01Speaker 1: fire in sequence, a fraction of a second apart. Instead,
- 8:05Speaker 1: the charges detonated at the same instant. The simultaneous blast
- 8:09Speaker 1: sent a mechanical shockwave through the capsule structure. That shockwave
- 8:13Speaker 1: traveled directly into the pressure equalization valve. a small component
- 8:17Speaker 1: roughly the diameter of a coin, designed to open briefly
- 8:21Speaker 1: after landing to equalize internal and external air pressure. The
- 8:26Speaker 1: jolt knocked the valve open. At an altitude of approximately
- 8:29Speaker 1: 150 kilometers, in the vacuum above the Karman line, the
- 8:34Speaker 1: cabin atmosphere began venting into space. There was no warning light.
- 8:38Speaker 1: There was no alarm. The pressure inside the descent capsule
- 8:42Speaker 1: dropped from normal to zero, In under 70 seconds, cardiac arrest,
- 8:47Speaker 1: the post-mortem would establish, occurred within 40 seconds of the
- 8:51Speaker 1: pressure loss beginning. 40 seconds. The crew would have regained
- 8:55Speaker 1: consciousness for perhaps 15 of those seconds after the pressure
- 8:58Speaker 1: drop began. Enough time to feel something was wrong. Possibly
- 9:03Speaker 1: enough time to reach toward the valve. Victor Patsiev's body
- 9:07Speaker 1: was found positioned near the equalization valve. His hand was
- 9:11Speaker 1: close to it. The valve was partially closed. He had
- 9:14Speaker 1: reached it. He had gotten his hand on it. He
- 9:17Speaker 1: had not been able to finish. Here is where the
- 9:19Speaker 1: physics become unbearable. The valve was not inaccessible. It was
- 9:24Speaker 1: not behind a panel. Not behind wiring. Not in a
- 9:27Speaker 1: sealed compartment. It was reachable. A person who knew where
- 9:31Speaker 1: it was and moved immediately, with full motor control, could
- 9:35Speaker 1: close it manually. But 40 seconds is not a long
- 9:39Speaker 1: time when you are losing air. You cannot see from
- 9:42Speaker 1: a cause you cannot identify in a spacecraft falling through
- 9:46Speaker 1: the upper atmosphere. Alexei Leonov, the cosmonaut who had been
- 9:49Speaker 1: pulled from the prime crew four days before launch, later
- 9:53Speaker 1: sat down with a stopwatch. He ran his own test,
- 9:57Speaker 1: simulating how long it would take a trained person. to
- 10:00Speaker 1: locate the valve, recognize the problem, and manually force it shut.
- 10:04Speaker 1: It took him nearly a minute. That single number recontextualizes everything.
- 10:10Speaker 1: Leonov had warned before the mission that he did not
- 10:12Speaker 1: trust the pressure valves to close automatically in an emergency.
- 10:16Speaker 1: He had said it, The concern had been acknowledged. The
- 10:20Speaker 1: mission had launched anyway. And when he timed himself doing
- 10:23Speaker 1: what Patsaev had attempted, he arrived at a figure that
- 10:27Speaker 1: meant it was already over before anyone could have reached
- 10:30Speaker 1: it in time. Patsaev had moved toward the valve within
- 10:33Speaker 1: seconds of the pressure drop. He had closed it partway.
- 10:37Speaker 1: He had done exactly what a trained cosmonaut was supposed
- 10:39Speaker 1: to do. It was not enough. It could not have
- 10:43Speaker 1: been enough for anyone. The three men of Soyuz 11, Dobrovolsky,
- 10:47Speaker 1: Volkov and Patsiev died at an altitude above 100 kilometers
- 10:52Speaker 1: in the vacuum of space more than 30 minutes before
- 10:55Speaker 1: their capsule touched down in Kazakhstan. They remain, to this day,
- 11:00Speaker 1: the only human beings ever to have died above the
- 11:03Speaker 1: Karman line. In space itself. Not during launch, not during re-entry,
- 11:09Speaker 1: not on impact, in space. And the capsule that carried
- 11:13Speaker 1: them home landed exactly where it was supposed to. When
- 11:17Speaker 1: the recovery helicopters reached the capsule on June 30th, 1971,
- 11:21Speaker 1: the medical teams came running. They had reason to run.
- 11:26Speaker 1: The Soyuz 11 capsule had landed on target, on schedule,
- 11:30Speaker 1: with all parachutes deployed correctly. The radio had gone quiet
- 11:34Speaker 1: during blackout, as expected. Everything looked exactly as it should.
- 11:38Speaker 1: They knocked on the hatch. No answer. They opened it.
- 11:42Speaker 1: What happened next was not in any protocols. The support
- 11:45Speaker 1: crews pulled Georgi Dobrovolsky, Vladislav Volkov, and Viktor Potsev from
- 11:51Speaker 1: the capsule and began cardiopulmonary resuscitation. They worked on all
- 11:55Speaker 1: three men simultaneously, there on the steppe of Kazakhstan, in
- 12:00Speaker 1: the open air, with the capsule still warm from re-entry.
- 12:05Speaker 1: They kept working for a long time. Nobody stopped them,
- 12:09Speaker 1: because nobody on the ground yet knew what had actually
- 12:12Speaker 1: killed these men. The medical teams believed or hoped that
- 12:16Speaker 1: prolonged exposure to weightlessness had caused some kind of cardiovascular collapse.
- 12:21Speaker 1: That was the fear that had circulated among researchers before
- 12:24Speaker 1: the mission. That microgravity itself, after 23 days in orbit,
- 12:29Speaker 1: might prove fatal on return. So they attempted resuscitation. They
- 12:34Speaker 1: called for more equipment. They did everything they were trained
- 12:38Speaker 1: to do. The capsule had depressurized in space. It had
- 12:42Speaker 1: happened at an altitude above 100 kilometers. The three men
- 12:46Speaker 1: had been dead for more than 30 minutes before the
- 12:48Speaker 1: capsule entered the atmosphere. No resuscitation attempt on a landing
- 12:53Speaker 1: field in Kazakhstan was ever going to change that. The
- 12:56Speaker 1: doctors working on those three men did not know they
- 12:59Speaker 1: were trying to reverse something that had already been irreversible
- 13:02Speaker 1: for half an hour. That image, competent, trained people working
- 13:07Speaker 1: desperately on a problem that had already been solved by physics,
- 13:11Speaker 1: is the one that stays. The Soviet government did not
- 13:14Speaker 1: disclose the true cause of death publicly for nearly two years.
- 13:19Speaker 1: In the immediate aftermath, the official statements described the crew
- 13:22Speaker 1: as having been found in their seats, appearing to be asleep.
- 13:26Speaker 1: The cause of death was listed, eventually, as decompression. But
- 13:31Speaker 1: the full technical account of what had happened, the pressure
- 13:34Speaker 1: equalization valve, the simultaneous bolt detonation, the 42nd window, Patsayev,
- 13:40Speaker 1: at the valve, did not enter the public record until
- 13:43Speaker 1: much later. In the meantime, Western space agencies were left
- 13:47Speaker 1: to reconstruct what they could from fragmentary reports. NASA's own
- 13:52Speaker 1: concern in that period was partly selfish and partly genuine.
- 13:56Speaker 1: American astronauts were preparing for their own long-duration missions. If
- 14:00Speaker 1: Soviet cosmonauts had died from the physiological effects of extended weightlessness,
- 14:05Speaker 1: that changed the calculus for everything. It was only when
- 14:09Speaker 1: the actual technical cause became clearer that the specific, singular
- 14:13Speaker 1: nature of the failure could be understood. This was not
- 14:17Speaker 1: a systemic problem with human bodies in space. It was
- 14:20Speaker 1: a valve. One valve. Two bolts. Forty seconds. The Soyuz
- 14:25Speaker 1: program was grounded after the accident. Engineers went back through
- 14:29Speaker 1: the entire design of the descent module. What they found
- 14:33Speaker 1: was not a complex cascade of failures, or a theoretical
- 14:37Speaker 1: flaw that had slipped through review. They found a mechanism
- 14:40Speaker 1: that worked correctly in every test condition, but could, under
- 14:43Speaker 1: the specific dynamic stress of explosive bolt separation, be jolted
- 14:48Speaker 1: open by the vibration itself. The very force that was
- 14:51Speaker 1: supposed to separate the modules safely was the force that
- 14:54Speaker 1: could open an air seal that was supposed to stay closed.
- 14:58Speaker 1: The fix was not complicated. It was a redesigned valve
- 15:02Speaker 1: with a manual override that a cosmonaut could close by
- 15:05Speaker 1: hand in a single motion faster than the equalization process
- 15:09Speaker 1: could complete. It was also a new suit, the Sokol suit,
- 15:13Speaker 1: a full-pressure garment worn during launch and landing, designed to
- 15:17Speaker 1: keep a cosmonaut alive through a depressurization event long enough
- 15:21Speaker 1: to respond. Not a guarantee, a margin. A few minutes
- 15:25Speaker 1: of breathable air and survivable pressure in a sealed suit
- 15:28Speaker 1: while the crew assessed and acted, the Sokol suit entered
- 15:31Speaker 1: service in 1974. Updated versions of that suit remain in
- 15:36Speaker 1: use today. Every cosmonaut who has launched aboard a Soyuz
- 15:40Speaker 1: since then has worn a direct descendant of the design
- 15:43Speaker 1: that came out of the inquiry into what happened to Dobrovolsky, Volkov,
- 15:47Speaker 1: and Patsyev. Every American astronaut who flew to the International
- 15:51Speaker 1: Space Station aboard a Soyuz capsule wore one. Every crew
- 15:56Speaker 1: that has launched in a commercial vehicle since then has
- 15:59Speaker 1: worn a pressure suit during the critical phases of flight.
- 16:03Speaker 1: Because the principle has held across every subsequent program, the
- 16:06Speaker 1: ascent and descent phases carry specific risks that a pressure
- 16:11Speaker 1: garment can partially mitigate. Three men died, and the suit
- 16:15Speaker 1: they were not wearing became standard equipment for every human
- 16:18Speaker 1: being who has gone to space since. There is a
- 16:21Speaker 1: monument outside Moscow, at the Kremlin Wall. Georgy Dobrovolsky, Vladislav Volkov,
- 16:28Speaker 1: and Viktor Potseyev are buried there, near Yuri Gagarin. near
- 16:32Speaker 1: Vladimir Komarov, near the others who did not come back.
- 16:36Speaker 1: The state gave them that honor. It was the correct
- 16:39Speaker 1: thing to do, and it was also the kind of
- 16:41Speaker 1: honor that is easier to give than the truth. The
- 16:44Speaker 1: truth took two years. Across the world in a very
- 16:48Speaker 1: different political context, a small aluminum plaque was left on
- 16:52Speaker 1: the surface of the moon by the Apollo 15 crew
- 16:56Speaker 1: in August of 1971. Less than two months after Soyuz 11,
- 17:01Speaker 1: The plaque is called The Fallen Astronaut. It lists the
- 17:04Speaker 1: names of 14 people who had died in the service
- 17:08Speaker 1: of space exploration. Three of those names are Dobrovolsky, Volkov,
- 17:13Speaker 1: and Patsaev, an American crew on the lunar surface, honoring
- 17:17Speaker 1: Soviet cosmonauts who had died two months before. The Cold
- 17:21Speaker 1: War was still fully operational. The plaque went anyway. Patsaev's memorial,
- 17:26Speaker 1: in his hometown of Aktyubinsk, now Aktobe, in Kazakhstan, was
- 17:32Speaker 1: vandalized badly enough that it had to be removed. In 2013,
- 17:37Speaker 1: Roscosmos restored it. A new monument in the same city
- 17:41Speaker 1: where he was born, standing again. Viktor Patsaev was 44
- 17:45Speaker 1: years old. He was the first human being to operate
- 17:48Speaker 1: a telescope in space, aboard Salyut 1. He was also,
- 17:52Speaker 1: by the physical evidence, the last person on Soyuz 11
- 17:56Speaker 1: to act. He moved toward the valve. He positioned himself
- 18:00Speaker 1: at it. He got it partway closed. In the remaining seconds,
- 18:05Speaker 1: with pressure dropping and consciousness failing, he did the thing
- 18:08Speaker 1: a trained engineer and cosmonaut would do. He worked the problem.
- 18:13Speaker 1: He was 40 seconds from a solution that required a minute.
- 18:16Speaker 1: Georgi Dobrovolsky was 43. He was the mission commander, making
- 18:21Speaker 1: his first spaceflight. He had been added to the crew
- 18:24Speaker 1: four days before launch, replacing Leonov because a chest X-ray
- 18:28Speaker 1: had flagged a possible abnormality in Valery Kubasov that turned
- 18:33Speaker 1: out to be nothing serious. Dobrovolsky had not been scheduled
- 18:36Speaker 1: to die on Soyuz 11. He had been scheduled to
- 18:39Speaker 1: fly later. A medical precaution put him on this mission instead.
- 18:43Speaker 1: Vladislav Vokov was 35. He was the only one of
- 18:47Speaker 1: the three who had flown in space before, having been
- 18:50Speaker 1: part of the Soyuz 7 mission in 1969. He had
- 18:54Speaker 1: been part of the original backup considerations and had trained
- 18:57Speaker 1: extensively for long-duration spaceflight. He was 35 years old. These
- 19:03Speaker 1: were not symbols before they were people. They were engineers
- 19:06Speaker 1: and pilots who had spent years preparing for a mission
- 19:09Speaker 1: that asked everything of them, and then asked more than
- 19:12Speaker 1: physics allowed anyone to give. The capsule that brought them
- 19:15Speaker 1: home landed exactly where it was supposed to land. The
- 19:18Speaker 1: parachutes opened on schedule. The retrocotics fired. The descent was textbook.
- 19:24Speaker 1: Every automatic system performed exactly as designed. The craft touched
- 19:28Speaker 1: down on the Kazakh step at the correct coordinates. at
- 19:31Speaker 1: the correct time, having completed 23 days and 18 hours
- 19:35Speaker 1: in orbit, including a successful docking with the Salyut 1
- 19:39Speaker 1: space station. In the morning silence on that step, with
- 19:43Speaker 1: the capsule sitting upright in the grass, the only thing
- 19:46Speaker 1: the mission had failed to return was the three men
- 19:49Speaker 1: inside it. They knocked, and there was no response from within.
- 19:53Speaker 1: That silence was not a malfunction. The mission had worked.
- 19:58Speaker 1: The hardware had done everything it was asked to do.
- 20:01Speaker 1: The silence was the record of what 40 seconds means
- 20:04Speaker 1: when the margin disappears, when the warning was given and
- 20:07Speaker 1: acknowledged and set aside. when the only person close enough
- 20:11Speaker 1: to act was already running out of time before he
- 20:13Speaker 1: took his first step. Dobrovolsky, Volkov, and Patsayev remained the
- 20:19Speaker 1: only human beings ever to have died above the Karman line.
- 20:23Speaker 1: Not in an explosion. Not on impact. In the quiet,
- 20:28Speaker 1: in space, on the way home, in a capsule that
- 20:31Speaker 1: landed perfectly. The clock ran out at 100 kilometers above
- 20:35Speaker 1: the Earth. Everything after that was just the landing. This
- 20:39Speaker 1: show is made by Oboe Media.