Japanese submarine I-20

History
Empire of Japan
Name	Submarine No. 46
Builder	Mitsubishi Kobe Yard, Kobe
Laid down	16 November 1937
Renamed	I-20
Launched	25 January 1939
Completed	26 September 1940
Commissioned	26 September 1940
Fate	Lost after 31 August 1943
Stricken	1 December 1943
General characteristics
Class and type	Type C1 submarine
Displacement	2,595 tonnes (2,554 long tons) surfaced 3,618 tonnes (3,561 long tons) submerged
Length	109.3 m (358 ft 7 in) overall
Beam	9.1 m (29 ft 10 in)
Draft	5.3 m (17 ft 5 in)
Installed power	12,400 bhp (9,200 kW) (diesel) 2,000 hp (1,500 kW) (electric motor)
Propulsion	Diesel-electric 1 × diesel engine 1 × electric motor
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 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth	100 m (330 ft)
Crew	95
Armament	8 × bow 533 mm (21 in) torpedo tubes 1 × 14 cm (5.5 in) deck gun 2 × single or twin 25 mm (1 in) Type 96 anti-aircraft guns
Notes	Fitted to carry 1 × Type A midget submarine

I-20 was one of five Type C cruiser submarines of the C1 sub-class built for the Imperial Japanese Navy. During World War II, she operated as the mother ship for a midget submarine during the attack on Pearl Harbor and the attack of Diego-Suarez, conducted war patrols in the Pacific Ocean and Indian Ocean, and served in the Guadalcanal campaign and New Guinea campaign. She was last heard from on 31 August 1943.