Soviet S-class submarine

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Class overview
Name	S class
Operators	Soviet Navy  People's Liberation Army Navy
Preceded by	Shchuka class
Succeeded by	K class Whiskey class
Completed	56
General characteristics
Type	Attack submarine
Displacement	840 tonnes (surfaced) 1,050 tonnes (submerged)
Length	77.8 m (255 ft 3 in)
Beam	6.4 m (21 ft 0 in)
Draught	4.4 m (14 ft 5 in)
Propulsion	2 × diesels (2,000 hp; 1,500 kW) 2 × electric motors (550 hp; 410 kW) 2 × propeller shafts
Speed	19.5 knots (36.1 km/h) surfaced 9 knots (17 km/h) submerged
Range	9,800 nmi (18,100 km) at 10.4 knots (19.3 km/h) surfaced 148 nmi (274 km) at 3 knots (5.6 km/h) submerged
Test depth	100 m (330 ft)
Complement	8 officers 16 noncommissioned officers 21 ratings
Sensors and processing systems	2 × periscopes Mars-12 microphone system Sirius communication system ASDIC (on some boats)
Armament	6 × 533 mm (21 in) torpedo tubes (4 forward, 2 aft, 12 torpedoes) 1 × 100 mm (4 in) B-24-2 gun 1 × 45 mm (1.8 in) 21-K gun Mines

The S-class or Srednyaya (Russian: Средняя, "medium") submarines were part of the Soviet Navy's underwater fleet during World War II. Unofficially nicknamed Stalinets (Russian: Сталинец, "follower of Stalin"; not to be confused with the submarine L-class L-2 Stalinets of 1931), boats of this class were the most successful and achieved the most significant victories among all Soviet submarines. In all, they sank 82,770 gross register tons (GRT) of merchant shipping and seven warships, which accounts for about one-third of all tonnage sunk by Soviet submarines during the war.