The Narodovolets D-2 submarine is a Decembrist-class submarine which was launched in 1929 as part of the Soviet Baltic Fleet.  It saw active service during the Second World War carrying out torpedo attacks.  It continued its service up until 1956.  In 1989 it was decided to turn the submarine into a museum which was finally opened in 1993 as a branch of the Central Naval Museum, allowing visitors to see the authentic interior of a Second World War era submarine.