Japanese submarine Ro-64

RO-64 in 1945
History
Japan
Name	Submarine No. 79
Builder	Mitsubishi, Kobe, Japan
Laid down	15 October 1923
Launched	19 August 1924
Renamed	Ro-64 on 1 November 1924
Completed	30 April 1925
Commissioned	30 April 1925
Decommissioned	10 December 1928
Recommissioned	1 December 1929
Decommissioned	1 December 1932
Recommissioned	25 March 1933
Decommissioned	1 December 1936 (possibly — see text)
Recommissioned	1 May 1939 (possibly — see text)
Decommissioned	20 March 1940
Recommissioned	26 July 1940
Fate	Sunk 12 April 1945
Stricken	10 August 1945
General characteristics
Class and type	Type L4 (Ro-60-class)
Displacement	988 long tons (1,004 t) (surfaced) 1,301 tons (1,322 t) (submerged)
Length	78.39 m (257.2 ft)
Beam	7.41 m (24.3 ft)
Draft	3.96 m (13.0 ft)
Propulsion	2 × Vickers diesels, 2 shafts 2,400 bhp (surfaced), 1,600 (submerged)
Speed	15.7 knots (29.1 km/h) (surfaced) 8.6 knots (15.9 km/h) (submerged)
Range	5,500 nautical miles (10,200 km) at 10 knots (19 km/h) (surfaced) 80 nautical miles (150 km) at 5.7 knots (10.6 km/h) (submerged)
Test depth	60 m (200 ft)
Complement	48
Armament	6 × 533 mm torpedo tubes (6 × bow) 12 × 6th Year Type torpedoes 1 × 76.2 mm (3.00 in) L/40 naval gun 1 × 6.5 mm machine gun

Ro-64, originally named Submarine No. 79, was an Imperial Japanese Navy Type L submarine of the L4 subclass. First commissioned in 1925, she served in the waters of Japan and Chōsen prior to World War II. During World War II, she operated in the Central Pacific, supported the Japanese invasion of Rabaul, and took part in the Aleutian Islands campaign, then in late 1942 was relegated to a role as a training ship. She was sunk in April 1945.