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How deep is Kola Borehole, world’s deepest man-made hole?
The Kola Superdeep Borehole, although only 9 inches in diameter ... At this point, the scientists felt the need to revise the temperature map of the Earth's interior due to encountering ...
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World's deepest hole sealed up for concerning reason
The Kola Superdeep Borehole is the deepest manmade hole, and deepest artificial point, on Earth, measuring at 40,230ft feet. To put it into perspective, that's 12.2km, or 7.58 miles - that's the ...