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Earth’s Holes
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From XKCD, a tour of some of the Earth’s deepest and most notable holes, including mines, caves, boreholes, subway stations, lakes, tunnels, neutrino detectors, and, of course, the Mariana Trench.
I was surprised to learn that a pair of boreholes, the Kola Superdeep Borehole and the Deepwater Horizon Borehole, are actually deeper than the Mariana Trench. Explain XKCD has more info on each of the various holes, including the truly bonkers Cave of Crystals in Mexico.
Tags: geology · infoviz · Randall Munroe · xkcd