First deep-ocean dive

First deep-ocean dive
Who
William Beebe, Otis Barton
Where
Not Applicable ()
When
On 15 August 1934, William Beebe (USA, 1877–1962) and Otis Barton (USA, 1899–1992) descended to a then-record depth of 923 m (3,028 ft) in a tethered bathysphere off Bermuda in the Caribbean.