![]() ![]() ![]() In 1981, the submersible was refitted with a titanium personnel hull to dive to 20,000 ft (6,100 m). It spent much of its service life on loan to the Woods Hole Oceanographic Institution.ĭSV-4 initially had a maximum dive depth of 6,500 feet (2,000 m) all Alvin-class personnel pressure hulls were originally designed for 6,000 ft (1,800 m), but subsequent testing allowed a higher rating. ![]() Sea Cliff was built by Electric Boat in Groton, Connecticut for the U.S. The Alvin-class DSVs were designed to replace older DSVs, such as the less-maneuverable Trieste-class bathyscaphes. US Navy crewed deep-ocean research submersibleĭSV-4 (formerly known as Sea Cliff) is a 25-ton, crewed deep-ocean research submersible owned by the United States Navy, now known only by its hull number, not by its former name.ĭSV-4 is an Alvin-class deep submergence vehicle (DSV), a sister ship to Turtle (DSV-3) and Alvin (DSV-2). ![]()
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