British T-class submarine

	HMS Thorn
Class overview
Name	T class
Operators	Royal Navy; Royal Netherlands Navy; Israeli Navy;
Preceded by	Grampus class
Succeeded by	U class
Completed	53
General characteristics
Type	Submarine
Displacement	1,290 tons surfaced; 1,560 tons submerged;
Length	276 ft 6 in (84.28 m)
Beam	25 ft 6 in (7.77 m)
Draught	12 ft 9 in (3.89 m) forward; 14 ft 7 in (4.45 m) aft;
Propulsion	Twin diesel engines, 1,250 hp (930 kW) each; Twin electric motors, 1,450 hp (1,080 kW) each; Two shafts;
Speed	15.5 knots (28.7 km/h; 17.8 mph) surfaced; 9 knots (17 km/h; 10 mph) submerged;
Range	8,000 nmi (15,000 km; 9,200 mi) at 10 kn (19 km/h; 12 mph) surfaced with 131 tons of fuel
Complement	48
Time to activate	1938-1969 (RN)
Armament	6 bow torpedo tubes; 4 external torpedo tubes; 16 torpedoes; 1 QF 4 inch (100 mm) deck gun;

The Royal Navy's T class (or Triton class) of diesel-electric submarines was designed in the 1930s to replace the O, P, and R classes. Fifty-three members of the class were built just before and during the Second World War, where they played a major role in the Royal Navy's submarine operations. Four boats in service with the Royal Netherlands Navy were known as the Zwaardvisch class.

In the decade following the war, the oldest surviving boats were scrapped and the remainder converted to anti-submarine vessels to counter the growing Soviet submarine threat. The Royal Navy disposed of its last operational boat in 1969, although it retained one permanently moored as a static training submarine until 1974. The last surviving boat, serving in the Israel Sea Corps, was scrapped in 1977.

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