at Toulon naval base, and renamed FNRS-3. It was relaunched in 1953 under the command of Georges Houot, a French naval officer. DSV-0 Trieste The X-1 Trieste bathyscaphe has reached Challenger Deep, the world's deepest seabed. It was retired in 1966. DSV-1 X-2 Trieste II An updated bathyscaphe design, it participated in clandestine missions. Trieste II was retired in 1984. Alvin-class submersibles Alvin operates from R/V Atlantis, an AGOR-23 class vessel owned by the ONR and operated by WHOI under a charter party agreement. The NSF has committed to the construction of a replacement submersible with enhanced capabilities and depth capability to replace Alvin, which will be retired upon its completion. DSV-2 Alvin Launched in June 1964 with an initial depth capability of , extended in 1973 to . Owned by the United States Navy and operated under secondment by the Woods Hole Oceanographic Institution (WHOI) where it conducts science-oriented missions funded by the National Science Foundation (NSF), National Oceanic and Atmospheric Administration (NOAA) and the Office of Naval Research (ONR). Alvin operates from R/V Atlantis, an AGOR-23 class vessel owned by the ONR and operated by WHOI under a charter party agreement. The NSF has committed to the construction of a replacement submersible with enhanced capabilities and depth capability to replace Alvin, which will be retired upon its completion. DSV-3 Turtle Alvins identical sibling, launched in December 1968 and retired 1998. Owned and operated by the United States Navy. DSV-4 Sea Cliff Another Alvin-class DSV sub, launched in December 1968, retired in 1998, and returned to active service in September 2002. Sea Cliff has a depth capability of , and is owned and operated by the United States Navy. DSV-5 Nemo Another Alvin-class DSV sub, launched in June 1970 and retired in 1998. Owned and operated by the United States Navy. Star-class DSV Star II Star III Both Star II and Star III were built by General Dynamics Electric Boat Division in Groton, Connecticut. Both were launched on May 3, 1966 and were used for civilian research. NR-1–class DSVN NR-1 a decommissioned US Navy nuclear powered research and clandestine DSV submarine, which could roll on the seabed using large balloon wheels. Aluminaut Aluminaut a DSV made completely of aluminum by the Reynolds Metals Aluminum Company, for the US Navy, once held the submarine deep diving record. It is no longer operational. Deepsea Challenger Deepsea Challenger a DSV made by