the submarine. On 20 September 1963, Requin completed her 5000th dive. From 7 January 1964 into May, she operated with the Sixth Fleet, then resumed her Second Fleet duties into 1968, interrupted only twice for extended deployments. Operation UNITAS VII in the fall of 1966 called for Requin to cruise around the South American continent for exercises with various South American navies. Her last Sixth Fleet deployment sent her back to the Mediterranean for duty from 4 April to 27 July 1967. Requins last Mediterranean deployment began on 4 April 1967. On 8 June, just as she completed a series of exercises with the U.S. Sixth Fleet, she received word that the U.S. signals intelligence ship was under attack. Requins crew prepared to go to the defense of Liberty, but received orders from the Sixth Fleet commander to surface and proceed to Crete. On 28 May 1968, during her last deployment before decommissioning, Requin departed Norfolk, Virginia, as part of the search effort for the missing nuclear attack submarine . On 29 June 1968, Requin was reclassified as an auxiliary submarine, AGSS-481, and in October 1968 she began inactivation at Naval Station Norfolk. Decommissioning and disposal Decommissioned on 3 December 1968, Requin was towed to St. Petersburg, Florida in February 1969, and served there as a non-powered Naval Reserve training vessel for Naval Reserve Center St. Petersburg, adjacent to Albert Whitted Airport and Coast Guard Air Station St. Petersburg. On 30 June 1971 Requin was reclassified as a miscellaneous auxiliary submarine, IXSS-481''', and on 20 December 1971 she was struck from the Naval Vessel Register. Preservation On 17 June 1972 Requin was transferred to a non-profit memorial foundation in Tampa, Florida, and docked in the Hillsborough River adjacent to Curtis Hixon Hall and the Tampa Museum of Art, across the river from the University of Tampa, as a tourist attraction. She remained in this role until 1986 when the non-profit organization responsible for the submarine folded due to insolvency and Requin was closed down due to lack of funding and support. Except for briefly reopening in 1988, she essentially remained abandoned at the pier for the subsequent four years. On 21 February 1990, Senator John Heinz introduced Senate Bill S.2151, which allowed Requin to be transferred as an exhibit for the Carnegie Science Center in Pittsburgh, Pennsylvania. On 24 May, Requin was towed to Tampa Shipyard for dry docking and