There are about 20 deep trenches in the world’s oceans. The eight deepest would be deep enough to submerge Mount Everest. The Marianas Trench is the deepest point in the deepest ocean, the Pacific . It was discovered in 1951 and explored in 1960 when Jacques Piccard (Switzerland) and Donald Walsh (USA) descended in their bathyscaphe Trieste 2 to a depth that has since been calculated as 10,916 m (35,813 ft).
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