Challenger deep

Challenger deep

n March 26, 2012, Canadian film director James Cameron (born August 16, 1954) has reached the bottom of the Mariana Trench in the submersible vessel Deepsea Challenger. He is the first person to do this in a solo descent, and is only the third person to do so ever.

The first was the manned descent by Swiss-designed, Italian-built, United States Navy-owned bathyscaphe Trieste which reached the bottom at 1:06 pm on 23 January 1960, with Don Walsh and Jacques Piccard on board. Iron shot was used for ballast, with gasoline for buoyancy. The onboard systems indicated a depth of 11,521 m (37,799 ft), but this was later revised to 10,916 m (35,814 ft). There were also two unmanned descents: ROVs Kaikō in 1996 and Nereus in 2009.

These first three expeditions directly measured very similar depths of 10,902 to 10,916 m.

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