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DSV-4 (ex-''Sea Cliff'') is a 25-ton, manned deep-ocean research submersible owned by the United States Navy, now known only by its hull number, not by its former name. ''DSV-4'' is an ''Alvin''-class Deep Submergence Vehicle (DSV). a sister ship to DSV ''Turtle'' (DSV-3) and DSV ''Alvin'' (DSV-2). The ''Alvin''-class DSVs were designed to replace older DSVs, such as the less-maneuverable ''Trieste''-class bathyscaphes.''DSV-4'' originally had a maximum dive depth of 6,500 feet (2,000 meters), as all ''Alvin''-class DSVs did at first. It was redesigned to dive to 20,000 feet (6,096 meters) and refitted in 1984. With the refit of ''DSV-4'', the bathyscaphe ''DSV-1'' (ex-''Trieste II'') was retired from service. ''DSV-4'' has a plug hatch 2 feet (0.61 meter) in diameter, held in place mechanically with hatch dogs and, while submerged, by the pressure of the water above it. ''DSV-4'' can dive 5,000 feet (1,524 meters) deeper than the famed ''Alvin''; however, the Super ''Alvin''-class replacement for ''DSV-2'' is designed to dive to 22,000 feet (6,705 meters). ''Sea Cliff'' was retired from active service in 1998 and subsequently given to Woods Hole Oceanographic Institution (). The Naval Vessel Register shows ''DSV-4'' was returned to active U.S Navy service on 30 September 2002 in the custody of Woods Hole (), but a ''New York Times'' article indicates that it was cannibalized for parts for DSV ''Alvin'' (). ==See also== * Deep Submergence Vehicle * Deep Submergence Rescue Vehicle * Bathyscaphe Trieste (DSV-0) * Bathyscaphe Trieste II (DSV-1) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DSV Sea Cliff」の詳細全文を読む スポンサード リンク
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