<P> The USS R - 1 ( SS - 78 ) , originally commissioned on 16 December 1918 and decommissioned after more than 12 years of service , was recommissioned and served for five additional years during WWII . R - 1 was decommissioned at Key West on 20 September 1945 and was struck from the Naval Vessel Register on 10 November . Still at Key West awaiting disposal on 21 February 1946 , the submarine sank in 21 feet ( 6.4 m ) of water . Raised three days later , she was sold for scrap on 13 March 1946 </P>
<P> The USS R - 1 ( SS - 78 ) , originally commissioned on 16 December 1918 and decommissioned after more than 12 years of service , was recommissioned and served for five additional years during WWII . R - 1 was decommissioned at Key West on 20 September 1945 and was struck from the Naval Vessel Register on 10 November . Still at Key West awaiting disposal on 21 February 1946 , the submarine sank in 21 feet ( 6.4 m ) of water . Raised three days later , she was sold for scrap on 13 March 1946 </P>
when was the last time a us submarine sunk
when was the last time a us submarine sunk
21 February 1946
21 February 1946