People have been examining and researching the underwater part of our world since the Vikings, who measured its depths using rope and lead weight. In the mid-1800’s, the British were using other tools for collecting underwater specimens.
As for people themselves going underwater in suits and vessels, the first bathysphere was built in 1929, and taken to a record 3,028 feet in 1934. Jacques Cousteau improved diving equipment in the 1940’s, and the deepest humans have ever gone was on January 23, 1960, when Jacques Piccard and Don Walsh went to a depth of 35,798 feet.
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