The TNC allocated '' U-1305 '' to the Soviet Union . On 4 December 1945 , she arrived in Libau , Latvia , as British '' N '' - class '' N25 '' . On 13 February 1946 , the Soviet Navy allocated her to the Baltic Fleet . She was renamed '' S-84 '' on 9 June 1949 , then sent to the reserve fleet on 30 December 1955 . '' S-84 '' went to the Northern Fleet as a test hulk and was later sunk in the Barents Sea on 10 October 1957 , during an atomic bomb test off of Novaja Zemlja
atomic bomb test
1957 Soviet nuclear tests
German submarine U-1305