Japanese submarine I-21

History
Japan
Name	I-21
Builder	Kawasaki shipyard, Kobe
Laid down	7 January 1939
Launched	24 February 1940
Completed	15 July 1941
Fate	Lost after 27 November 1943. Probably sunk 29 November 1943 by TBF Avengers from CVE USS Chenango off Tarawa.[1]
General characteristics
Class and type	Type B1 submarine
Displacement	2,584 long tons (2,625 t) surfaced 3,654 long tons (3,713 t) submerged
Length	108.6 m (356 ft 4 in)
Beam	9.3 m (30 ft 6 in)
Draft	5.14 m (16 ft 10 in)
Propulsion	2 × Diesel engines, 12,400 hp (9,200 kW) Electric motors, 2,000 hp (1,500 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) at 16 kn (30 km/h; 18 mph)
Test depth	100 m (330 ft)
Complement	94
Armament	6 × 533 mm (21 in) torpedo tubes 17 × torpedoes 1 × 14 cm/40 11th Year Type naval gun[2]
Aircraft carried	1 × Yokosuka E14Y floatplane

I-21 (伊号第二一潜水艦, I-gō Dai Nijū-ichi sensui-kan) was a Japanese Type B1 submarine which saw service during World War II in the Imperial Japanese Navy. She displaced 1,950 tons and had a speed of 24 knots (44 km/h). I-21 was the most successful Japanese submarine to operate in Australian waters, participating in the attack on Sydney Harbour in 1942 and sinking 44,000 tons of Allied shipping during her two deployments off the east coast of Australia.^[3]