Our Planet

How deep is the ocean?


An amazing video published on youtube by National Geographic. How deep is the ocean (on average) and the Mariana Trench, the deepest part of the world’s oceans?

On 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.

The video covers Cameron’s descent in one minute.


  1. Video says 1044 feet, but it was then. Now, in 2014, Ahmed Gabr, a 41-year-old Egyptian diver broke the record with 1090 feet 4.5 in (332.35 meter) in 2014. Ahmed’s amazing dive broke the previous mark of 318.25 m (1,044 ft) by South African Nuno Gomes in 2005, also off the coast of Dahab.
  2. In the video, it is marked as 8200 feet, but in 2014, Cuvier’s Beaked Whale Sets Records for Longest and Deepest Dive.
  3. Some unrepeated measurements place the deepest portion at 11.03 kilometers (6.85 mi, 36187.664 feet).