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Why the deepest hole on Earth was sealed, and what they discovered before it was closed!

Deep in the Arctic Circle, there’s a man-made hole that once earned the nickname “the entrance to hell.” The Kola Superdeep Borehole, the deepest hole ever drilled on Earth, reached a staggering 12 ...
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What if you fell into the deepest hole on Earth and reached the core?

This is the deepest hole mankind has ever dug. It's a straight drop into the bowels of the Earth. For 20 years, Russian ...