Soviet M-class submarine

	Series XII M-class submarine
Class overview
Operators	Soviet Navy; Polish Navy; People's Liberation Army Navy; Bulgarian Navy; Egyptian Navy;
Preceded by	None
Succeeded by	Quebec class
In service	1933
In commission	1933
Planned	141
Completed	141
Lost	33
Retired	108
General characteristics
Type	Submarine
Displacement	VI: 158 tons surfaced; 198 tons submerged; VI-bis: 161 tons surfaced; 201 tons submerged; XII: 206 tons surfaced; 256 tons submerged; XV: 281 tons surfaced; 351 tons submerged;
Length	VI to XII: 37.50 m (123 ft 0 in); XV: 50.0 m (164 ft 1 in);
Beam	VI and VI-bis: 3.1 m (10 ft 2 in); XII: 3.3 m (10 ft 10 in); XV: 4.9 m (16 ft 1 in);
Draft	VI and VI-bis: 2.6 m (8 ft 6 in); XII: 2.9 m (9 ft 6 in); XV: 3.6 m (11 ft 10 in);
Speed	VI and VI-bis: 13.1 knots (24 km/h) surfaced;; 7.4 knots (14 km/h) submerged; XII: 14.1 knots (26 km/h) surfaced;; 8.2 knots (15 km/h) submerged; XV: 15 knots (28 km/h) surfaced;; 10 knots (19 km/h) submerged;
Complement	VI to XII: 16-19; XV: 32;
Armament	VI to XII: 2 × 533 mm (21 in) bow torpedo tubes; XV: 4 × 533 mm (21 in) torpedo tubes (2 bow, 2 stern); All series: 1 × 45 mm (2 in) semi-automatic gun;

The M-class submarines, also Malyutka class (Russian: Малютка; baby or little one), were a class of small, single-, or 1½-hulled coastal submarines built in the Soviet Union and used during World War II. The submarines were built in sections so they could easily be transported by rail. The production was centered in the Gorky Shipyard on the Volga River, after which the sections were transported by railway to Leningrad for assembly and fitting out. This was the first use of welding on Soviet submarines.

Class overview
Series XII M-class submarine
Operators	Soviet Navy Polish Navy People's Liberation Army Navy Bulgarian Navy Egyptian Navy
Preceded by	None
Succeeded by	Quebec class
In service	1933
In commission	1933
Planned	141
Completed	141
Lost	33
Retired	108
General characteristics
Type	Submarine
Displacement	VI: 158 tons surfaced; 198 tons submerged VI-bis: 161 tons surfaced; 201 tons submerged XII: 206 tons surfaced; 256 tons submerged XV: 281 tons surfaced; 351 tons submerged
Length	VI to XII: 37.50 m (123 ft 0 in) XV: 50.0 m (164 ft 1 in)
Beam	VI and VI-bis: 3.1 m (10 ft 2 in) XII: 3.3 m (10 ft 10 in) XV: 4.9 m (16 ft 1 in)
Draft	VI and VI-bis: 2.6 m (8 ft 6 in) XII: 2.9 m (9 ft 6 in) XV: 3.6 m (11 ft 10 in)
Speed	VI and VI-bis: 13.1 knots (24 km/h) surfaced; 7.4 knots (14 km/h) submerged XII: 14.1 knots (26 km/h) surfaced; 8.2 knots (15 km/h) submerged XV: 15 knots (28 km/h) surfaced; 10 knots (19 km/h) submerged
Complement	VI to XII: 16-19 XV: 32
Armament	VI to XII: 2 × 533 mm (21 in) bow torpedo tubes XV: 4 × 533 mm (21 in) torpedo tubes (2 bow, 2 stern) All series: 1 × 45 mm (2 in) semi-automatic gun