Geologists and travel enthusiasts are familiar with many of the earth's deepest places. The Dead Sea is the lowest place on Earth in terms of feet below sea level. We know about the Marianas Trench. There are some super deep mines around the world. What's deeper than all of those features, though, is the Kola Superdeep Borehole. This is a hole that's actually man-made, but the bottom of it has...
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