Japanese submarine I-73

History
Empire of Japan
Name	I-73
Builder	Kawasaki, Kobe, Japan
Laid down	5 April or 5 November 1934 (see text)
Launched	20 June 1935
Completed	7 January 1937
Commissioned	7 January 1937
Fate	Sunk by USS Gudgeon, 27 January 1942
Stricken	15 March 1942
General characteristics
Class and type	Kaidai type (KD6A sub-class)
Displacement	1,814 tonnes (1,785 long tons) surfaced 2,479 tonnes (2,440 long tons) submerged
Length	104.7 m (343 ft 6 in)
Beam	8.2 m (26 ft 11 in)
Draft	4.57 m (15 ft 0 in)
Installed power	9,000 bhp (6,700 kW) (diesels) 1,800 hp (1,300 kW) (electric motors)
Propulsion	Diesel-electric 2 × diesel engines 2 × electric motors
Speed	23 knots (43 km/h; 26 mph) surfaced 8 knots (15 km/h; 9.2 mph) submerged
Range	14,000 nmi (26,000 km; 16,000 mi) at 10 knots (19 km/h; 12 mph) surfaced 65 nmi (120 km; 75 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth	75 m (246 ft)
Complement	70
Armament	6 × 533 mm (21 in) torpedo tubes (4 bow, 2 stern) 1 × 100 mm (3.9 in) deck gun 1 × 13.2 mm (0.52 in) anti-aircraft machinegun

I-73 was an Imperial Japanese Navy Kaidai type cruiser submarine of the KD6A sub-class commissioned in 1937 that served during World War II. One month after participating in the Japanese attack on Pearl Harbor, she was sunk by the United States Navy submarine USS Gudgeon (SS-211) in January 1942.