Japanese submarine I-401

I-401 in 1945
History
Japan
Name	I-401
Builder	Sasebo Naval Arsenal, Sasebo, Japan
Laid down	26 April 1943
Launched	11 March 1944
Completed	8 January 1945
Commissioned	8 January 1945
Stricken	15 September 1945
Fate	Surrendered 29 August 1945 Sunk as target 31 May 1946
General characteristics
Class and type	I-400-class submarine
Displacement	5,223 long tons (5,307 t) surfaced 6,560 long tons (6,665 t) submerged
Length	122 m (400 ft)
Beam	12 m (39 ft)
Draft	7 m (23 ft)
Propulsion	Diesel-electric 4 diesel engines, 7,700 hp (5,700 kW) Electric motors, 2,400 hp (1,800 kW)
Speed	18.75 knots (21.58 mph; 34.73 km/h) surfaced 6.5 kn (7.5 mph; 12.0 km/h) submerged
Range	37,500 nmi (69,400 km) at 14 kn (16 mph; 26 km/h)
Test depth	100 m (330 ft)
Complement	144
Armament	8 × 533 mm (21 in) forward torpedo tubes 20 × Type 95 torpedoes 1 × 14 cm/40 11th Year Type naval gun[1] 3 × 35 mm (1.4 in) 3-barrel machine gun 1 × Type 96 25 mm (0.98 in) machine gun
Aircraft carried	3 × Aichi M6A1 Seiran sea-planes

I-401 (伊号第四百一潜水艦, I-gō-dai yon-hyaku-ichi-sensuikan) was an Imperial Japanese Navy Sentoku-type (or I-400-class) submarine commissioned in 1945 for service in World War II. Capable of carrying three two-seat Aichi M6A1 "Seiran" (Mountain Haze) float-equipped torpedo bombers, the Sentoku-class submarines were built to launch a surprise air strike against the Panama Canal. Until 1965, the Sentaku-type submarines — I-401 and her sister ships I-400 and I-402 — were the largest submarines ever commissioned.