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Deep-submergence vehicle
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===''Trieste''-class bathyscaphes=== ; '''[[FNRS-2]]''' : The first bathyscaphe, developed by Swiss engineer [[Auguste Piccard]] and named after the [[Belgium|Belgian]] [[National Fund for Scientific Research|Fonds National de la Recherche Scientifique]] (FNRS), the funding organization for the venture. FNRS also funded the ''[[FNRS-1]],'' a balloon that set a world altitude record, also built by Piccard. This bathyscaphe consisted of a gasoline filled float, 22 feet long and 10 feet wide, and oval shaped. Gasoline being less dense than water, would provide buoyancy for when the bathyscaphe needed to rise to the surface.<ref name=":02">{{Cite book |last=Shenton |first=Edward H. |title=Diving for science |publisher=W. W. Norton & Company, Inc. |year=1972 |isbn=0-393-06380-1 |location=New York}}</ref> The ovular float was divided into six tanks for holding gasoline, having a combined total of 6,600 gallons.<ref name=":02" /> ; '''[[FNRS-3]]''' : After damage to the ''FNRS-2'' during its sea trials in 1948, the FNRS ran out of funding and the submersible was sold to the [[French Navy]] in 1950. It was subsequently substantially rebuilt and improved 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 [[Bathyscaphe Trieste|''Trieste'']]''' : The X-1 ''Trieste'' [[bathyscaphe]] has reached [[Challenger Deep]], the world's deepest seabed. It was retired in 1966.<ref>{{cite web |url=http://www.history.navy.mil/danfs/t8/trieste.htm |title=Trieste |publisher=History.navy.mil |access-date=2012-03-27 |url-status=dead |archive-url=https://web.archive.org/web/20100317120249/http://www.history.navy.mil/danfs/t8/trieste.htm |archive-date=2010-03-17 }}</ref> ; '''DSV-1 X-2 [[Bathyscaphe Trieste II|''Trieste II'']]''' : An updated bathyscaphe design, it participated in clandestine missions. ''Trieste II'' was retired in 1984.<ref>{{cite web |url=http://www.history.navy.mil/danfs/t8/trieste_ii.htm |archive-url=https://web.archive.org/web/20040308155258/http://www.history.navy.mil/danfs/t8/trieste_ii.htm |url-status=dead |archive-date=2004-03-08 |title=Trieste II |publisher=History.navy.mil |access-date=2012-03-27 }}</ref><ref>{{cite web|url={{Naval Vessel Register service craft URL|id=DSV1}} |title=No Name (DSV 1) |publisher=Nvr.navy.mil |date=2009-09-14 |access-date=2012-03-27}}</ref>
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