The Benthoscope was a deep sea

submersible A submersible is a small watercraft designed to operate underwater. The term "submersible" is often used to differentiate from other underwater vessels known as submarines, in that a submarine is a fully self-sufficient craft, capable of in ...

Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...

. He hired the Watson-Stillman Company, who had earlier constructed his and

William Beebe Charles William Beebe ( ; July 29, 1877 – June 4, 1962) was an American naturalist, ornithologist, marine biologist, entomologist, explorer, and author. He is remembered for the numerous expeditions he conducted for the New York Zoologica ...

's bathysphere to produce the new design of deep diving vessel, which was named from the Greek ''

benthos Benthos (), also known as benthon, is the community of organisms that live on, in, or near the bottom of a sea, river, lake, or stream, also known as the benthic zone.bathysphere, but was built to withstand higher pressures, with a crush depth of . Its internal diameter was , and its wall thickness was . It weighed , an increase in weight of over the bathysphere. Two windows of fused quartz were installed, one facing straight ahead and the other diagonally down. Other arrangements followed the bathysphere, with oxygen supplied from cylinders, and

calcium chloride Calcium chloride is an inorganic compound, a salt with the chemical formula . It is a white crystalline solid at room temperature, and it is highly soluble in water. It can be created by neutralising hydrochloric acid with calcium hydroxide. Cal ...

and soda lime used to absorb moisture and CO₂ respectively. In August 1949, Barton established a new world depth record with a solo descent to , which remains the deepest dive by a

suspended by a cable. The Benthoscope is now on display in front of the Los Angeles Maritime Museum in

San Pedro, California San Pedro ( ; Spanish: "St. Peter") is a neighborhood within the City of Los Angeles, California. Formerly a separate city, it consolidated with Los Angeles in 1909. The Port of Los Angeles, a major international seaport, is partially located wi ...

See also