DSV Sea Cliff
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 .
- Deep Submergence Vehicle
- Deep Submergence Rescue Vehicle
- Bathyscaphe Trieste (DSV-0)
- Bathyscaphe Trieste II (DSV-1)
Alvin class DSV
- ex-SEA CLIFF in the Naval Vessel Register
- Deep Submergence Vehicles article at the Federation of American Scientists web page
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