What is the closest to the centre of the Earth a human has ever been? i.e. the farthest depth below the surface of the earth (presumably by means of a tunnel or mine).
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wyckster
ANSWERS: 1
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" In 1960 Trieste, carrying Piccard's son Jacques Piccard and Lt. Don Walsh, reached the deepest point on the earth's surface, the Challenger Deep, in the Mariana Trench. As of 2006 the two remain the only people to reach this extreme depth. No manned vessel has ever repeated this feat. The Japanese sent an unmanned submersible to this depth, but this submersible was later lost at sea. Today there are no submersibles that can reach this depth. The onboard systems indicated a depth of 37,800 ft (11,521 m) but this was later corrected to 35,813 ft (10,916 m) by taking into account variations arising from salinity and temperature. Later and more accurate measurements made in 1995 have found the Challenger Deep to be shallower at 35,798 ft (10,911 m)." Source and further information: http://en.wikipedia.org/wiki/Bathyscaphe
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