Scientists Dug the Deepest Hole But Something Broke Their Drill
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The Guinness World Records award for "the deepest human invasion into the Earth's crust" goes to the Kola Superdeep Borehole. Its depth is 7.4 mi. You can find it in the icy part of Russia where the winter temperature of -40°F is a common thing. Local scientists started to dig it in the 1970s. The grand plan was to reach the depth of 9.3 mi. It was a purely scientific project to study the Earth's crust and maybe get to the hot mantle.
Up to the depth of 4.3 mi, the drill easily coped with granite rock. Then, denser layers came and broke…
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