Original build above, rebuild underneath.
Dekabrist (3 November 1928), Naradovoylets (19 May 1929), Krasnogvardeyets (12 July 1929) Builder: Baltic Revolyutsioner (16 April 1929), Spartakovets (28 September 1929), Yakobinets ( 12 May 1930) Builder: Nikolayev
Displacement: 933 tons (surfaced), 1354 tons (submerged)
Dimensions: 249940 x 21940 x 12960
Machinery: 2 Kolomna diesel engines, 2 electric motors, 2 shafts. 2600 bhp/1600 shp = 14/9 knots Range: 7500 nm at 9 knots surfaced, 132 nm at 2 knots submerged
Armament: 8 x 533mm torpedo tubes (6 bow, 2 stern), total 14 torpedoes, 1 x 100mm gun, 1 x 45mm AA gun, 1 x 7.62mm machine gun
Notes: Boris Mikhailovich Malinin designed this double-hull class, the first submarines built by the Soviet Union. They were good sea boats but suffered from stability problems, dived very slowly, and also displayed poor quality control in their construction. Numerous refits were necessary to correct these deficiencies, after which their time to dive was reduced from 3 minutes to 30 seconds. The first three boats went to the Baltic Fleet and the second group to the Black Sea. The Baltic Fleet units transferred to the Northern Fleet in 1933. The Dekabrist sank during exercises in Molotovskiy Bay in November 1940; the Yakobinets was bombed while dry-docked at Sevastopol on 12 November 1941; the Krasnogvardets failed to return from a patrol off the Norwegian coast in June 1942; the antisubmarine vessels UJ- 102 and UJ- 103 sank the Revolutsioner off Yevpatoria on 4 December 1943. The two surviving boats were stricken in the late 1950s, the Naradovoylets becoming a museum ship at Kronshtadt in the 1980s.