Drop Mount Everest into the Mariana Trench and it disappears completely — Challenger Deep is nearly 11 kilometres down, so Everest's summit would still sit over 2 kilometres underwater. In this video you learn: how deep Challenger Deep really is versus Everest's 8,849 metres; why crushing pressure over 1,000 times surface level still can't stop life down there; and how two men in a steel ball called Trieste became the first humans to reach the bottom in 1960.
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