Japanese submarine I-166

History
Empire of Japan
Name	I-66
Builder	Sasebo Navy Yard, Sasebo, Japan
Laid down	8 November 1929
Launched	2 June 1931
Completed	10 November 1932
Commissioned	10 November 1932
Decommissioned	1 November 1934
Recommissioned	1 December 1936
Decommissioned	1 December 1937
Recommissioned	1 September 1939
Renamed	I-166 on 20 May 1942
Fate	Sunk by HMS Telemachus, 17 July 1944
Stricken	10 September 1944
General characteristics
Class and type	Kaidai-class submarine (KD5 Type)
Displacement	1,732 tonnes (1,705 long tons) surfaced 2,367 tonnes (2,330 long tons) submerged
Length	97.7 m (320 ft 6 in)
Beam	8.2 m (26 ft 11 in)
Draft	4.7 m (15 ft 5 in)
Installed power	6,000 bhp (4,500 kW) (diesels) 1,800 hp (1,300 kW) (electric motors)
Propulsion	Diesel-electric 2 × diesel engines 2 × electric motors
Speed	20 knots (37 km/h; 23 mph) surfaced 8.25 knots (15.28 km/h; 9.49 mph) submerged
Range	10,800 nmi (20,000 km; 12,400 mi) at 10 knots (19 km/h; 12 mph) surfaced 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth	70 m (230 ft)
Complement	75
Armament	6 × 533 mm (21 in) torpedo tubes (4 bow, 2 stern) 1 × 120 mm (4.7 in) deck gun 1 × 13.2 mm (0.52 in) anti-aircraft machinegun

I-66, later I-166, was a Kaidai-class cruiser submarine of the KD5 sub-class completed for the Imperial Japanese Navy in 1932. She served during World War II, supporting the Japanese invasion of Malaya and the invasion of Sarawak, taking part in the Battle of Midway, and conducting numerous war patrols in the Indian Ocean before was sunk in July 1944.