Japanese submarine I-31

I-31 one day before launching, 12 March 1941
History
Empire of Japan
NameI-31
BuilderYokosuka Naval Yard
Laid down6 December 1939
Launched13 March 1941
Completed30 May 1942
FateSunk, 13 May 1943
General characteristics
Class & typeType B1 submarine
Displacement
  • 2,631 tonnes (2,589 long tons) surfaced
  • 3,713 tonnes (3,654 long tons) submerged
Length108.7 m (356 ft 8 in) overall
Beam9.3 m (30 ft 6 in)
Draft5.1 m (16 ft 9 in)
Installed power
Propulsion
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; 16,000 mi) at 16 knots (30 km/h; 18 mph) surfaced
  • 96 nmi (178 km; 110 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth100 m (330 ft)
Crew94
Armament
Aircraft carried1 × floatplane
Aviation facilities1 × catapult

The Japanese submarine I-31 was one of 20 Type B cruiser submarines of the B1 sub-class built for the Imperial Japanese Navy (IJN) during the 1940s.

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