Deep in the Arctic Circle, in Russia, lies the deepest hole ever dug which was once called 'the entrance to hell'. The Kola Superdeep Borehole is the deepest manmade hole, and deepest artificial point ...
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Why the Soviets sealed the deepest hole on Earth
The Soviet Union reached 12,262 meters underground, discovering fossils, hot water, and plastic-like rock before abandoning the deepest hole.
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