The deepest man-made hole on Earth is no longer a gaping wound in the Arctic rock but a quiet, sealed scar. Once hyped as a literal “entrance to hell” in feverish urban legends, the Kola Superdeep ...
Modern Engineering Marvels on MSN
World’s deepest blue hole reveals uncharted depths and hidden connections
It begins with a number that seems almost laughable: over 420 meters deep. That’s how far down explorers have probed the Taam ...
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