DSV Sea Cliff
DSV-4 (ex-Sea Cliff) is a 25-ton, manned deep-ocean research submersible owned by the United States Navy. It is sister to DSV Turtle (DSV-3), DSV Alvin (DSV-2), and also an Alvin class Deep Submergence Vehicle. The 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 service on September 30, 2002 in the custody of Woods Hole , but a New York Times article indicates that it was cannibalized for parts for DSV Alvin . It is now known only by its hull number, not by name.
The DSV-4 originally had a maximum dive depth of 6500 feet (2000 m), like all Alvin-class DSVs at first. It was redesigned to dive to 20,000 feet, and refitted in 1984. With the refit of DSV-4, DSV-1 (ex-Trieste II) was retired from service. It has a plug hatch 24 inches in diameter, held in place mechanically with hatch dogs, and while submerged, by the pressure of the water above it. The Alvin-class DSVs were designed to replace older DSVs, such as the less maneuverable Trieste-class bathyscaphes. The DSV-4 can dive 5,000 feet deeper than the famed Alvin; however, the super Alvin class replacement for DSV-2 is designed to dive to 22,000 feet.
- 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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