Crewed submersibles

thumb|Bathyscaphe Trieste (bathyscaphe)|Trieste before its only dive into the [[Mariana Trench]] thumb|The Trieste in 1958

thumb|right|200px|The Bathysphere on display at the National Geographic museum in 2009 The Bathysphere () was a unique spherical deep-sea submersible which was unpowered and lowered into the ocean on a cable, and was used to conduct a series of dives off the coast of Bermuda from 1930 to 1934. The Bathysphere was designed in 1928 and 1929 by the American engineer Otis Barton, to be used by the naturalist William Beebe for studying undersea wildlife. Beebe and Barton conducted dives in the Bathysphere together, marking the first time that a marine biologist observed deep-sea animals in their na

imploded submersible

The Benthoscope was a deep sea submersible designed by Otis Barton after the Second World War. He hired the Watson-Stillman Company, who had earlier constructed his and William Beebe's bathysphere, to produce the new design of deep diving vessel, which was named from the Greek benthos, meaning "bottom".