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Deepest Hole On Earth Permanently Sealed After 2 Billion-Year-Old Find.
Soviet scientists embarked on an ambitious project to drill as deep as possible into the Earth’s crust. The result was the Kola Superdeep Borehole, located in the remote Pechengsky District of ...
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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, holds the distinction of being the deepest hole, plunging to ... delving deeper than any other man-made structure.