Dekabrist-class submarine

D-3 Krasnogvardyeyets on a Soviet stamp
Class overview
Name	Dekabrist
Builders	3 at Ordzhonikidze Shipyard, Leningrad 3 at Marti Yard, Nikolayev
Operators	Soviet Navy
Preceded by	Bars class (Imperial Russian Navy)
Succeeded by	Leninets class
Built	1927–1929
In service	1928–1958
Planned	6
Completed	6
Lost	4
Retired	1
Preserved	1
General characteristics
Type	Diesel-electric attack submarine
Displacement	933 tons surfaced 1,354 tons submerged
Length	76.00 m (249 ft 4 in)
Beam	6.5 m (21 ft 4 in)
Draught	3.80 m (12 ft 6 in)
Propulsion	2 shafts, three-bladed propellers - Two 1,100 hp MAN/Kolomna diesels - Two 525 hp PG-20 electric motors - Two electric creeping motors 50 hp - 60 DK storage batteries
Speed	14 knots (26 km/h) surfaced 9 knots (17 km/h) submerged
Range	7,500 nmi (13,900 km) at 9 kn (17 km/h) surfaced 132 nmi (244 km) at 2 kn (3.7 km/h) submerged
Test depth	295 ft (90 m)
Complement	53 officers and crew
Armament	8 21-inch (533 mm) torpedo tubes (6 bow, 2 stern), 14 torpedoes carried 1 × 100 mm/51 cal. main deck gun 1 × 45 mm/46 cal. K-21 AA gun 1 × 7.62 mm machine gun

The Dekabrist class, also known as Series I, were the first class of submarines built for the Soviet Navy after the October Revolution of 1917. They were authorized in the Soviet Naval Shipbuilding Program of 1926, marking the revival of submarine design in Russia, and began their sea trials in 1930.

Of the six vessels built, two survived World War II, and one submarine of the class is now a museum ship.