Soviet S-class submarine

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.

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