Japanese submarine I-37

History
Imperial Japan
Name	Submarine No. 150
Ordered	1939
Builder	Kure Naval Arsenal, Kure, Japan
Laid down	7 December 1940
Launched	22 October 1941
Renamed	I-49, 22 October 1941 I-37, 1 November 1941
Completed	10 March 1943
Commissioned	10 March 1943
Fate	Sunk 19 November 1944
Stricken	10 March 1945
General characteristics
Class and type	Type B1 submarine
Type	Cruiser submarine
Displacement	2,589 long tons (2,631 t) surfaced 3,654 long tons (3,713 t) submerged
Length	108.7 m (356 ft 8 in)
Beam	9.3 m (30 ft 6 in)
Draft	5.1 m (16 ft 9 in)
Propulsion	Diesel-electric: 1 × diesel engine, 12,400 bhp (9,247 kW) 1 × electric motor, 2,000 hp (1,491 kW)
Speed	23.5 knots (43.5 km/h; 27.0 mph) surfaced 8 knots (15 km/h; 9.2 mph) submerged
Range	14,000 nmi (26,000 km; 16,000 mi) at 16 knots (30 km/h; 18 mph) surfaced 96 nmi (178 km); 110 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth	100 m (328 ft)
Crew	94
Armament	6 × bow 533 mm (21 in) torpedo tubes 1 × 14 cm (5.5 in) deck gun (removed September 1944) 2 × single 25 mm (0.98 in) Type 96 anti-aircraft guns 4 x kaiten (added September 1944)
Aircraft carried	1 x Yokosuka E14Y1 floatplane (removed September 1944)
Aviation facilities	1 x catapult (removed September 1944) 1 x hangar (removed September 1944)

I-37, originally numbered I-49, was a Japanese Type B1 submarine in service with the Imperial Japanese Navy during World War II.^[1] Commissioned in 1943, she made three war patrols, all in the Indian Ocean, during the last of which her crew committed war crimes by massacring the survivors of the merchant ships she sank. Subsequently, converted into a kaiten manned suicide attack torpedo carrier, she was sunk during her first kaiten mission in 1944.