
The Soviet Union's ambitious but ultimately unsuccessful attempt to drill the deepest hole in the world, reaching a depth of 12,262 meters, in pursuit of technological dominance over the United States during the Cold War.


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In the 1970s, the Soviet Union embarked on a madcap venture known as the Kola Superdeep Borehole project.

Why the Soviet Union Stopped Digging at 12,262 Meters When They Attempted to Drill Through the…

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The Soviet Union's Ambitious but Ill-Fated Attempt to Drill Through the Earth's Crust
