Japanese submarine I-72

History
Empire of Japan
Name	I-72
Builder	Mitsubishi Kobe Yard, Kobe, Japan
Laid down	16 December 1933
Launched	6 April 1935
Completed	7 January 1937
Commissioned	7 January 1937
Renamed	I-172, 20 May 1942
Stricken	15 December 1942
Fate	Sunk October–November 1942 (see text)
General characteristics
Class and type	KD6 Type, Kadai type submarine
Displacement	1,400 (1,785 maximum) tons surfaced; 2,440 tons submerged;
Length	322 ft 10 in (98.4 m)
Beam	26 ft 11 in (8.2 m)
Draught	15 ft 0 in (4.6 m)
Propulsion	Twin shaft Kampon 9,000 bhp (6,711 kW)/two stroke diesels
Speed	23 knots (43 km/h; 26 mph) diesel; 8.2 knots (15.2 km/h; 9.4 mph) electric;
Range	14,000 nmi (26,000 km; 16,000 mi)
Test depth	230 ft (70 m)
Complement	60–84 officers and enlisted
Armament	6 x torpedo tubes/14 21 in (533 mm) torpedoes; 1 x 100 mm (3.9 in) AA gun; 1 × 13.2 mm (0.52 in) AA gun;

I-72, later I-172, was a Kaidai-class cruiser submarine of the KD6 sub-class built for the Imperial Japanese Navy (IJN) during the 1930s. She served in the early months of World War II, supporting the attack on Pearl Harbor, patrolling in Hawaiian waters in early 1942, and taking part in the Guadalcanal campaign before she was sunk in November 1942.

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