The Pacific War Online Encyclopedia

Photograph of Japanese submarine I-6

Tonnage	1900 tons standard 2243 tons surfaced 3061 tons submerged
Dimensions	323'2" by 29'9" by 17'5" 98.50m by 9.07m by 5.31m
Maximum speed	20 knots (surfaced) 7.5 knots (submerged)
Dive	to 260 feet (80 meters)
Complement	97
Aircraft	1 seaplane
Armament	1 5"/40 dual-purpose gun 1 13mm/76 machine gun 6 21" torpedo tubes (17 torpedoes)
Machinery	2-shaft diesel (8000 bhp) or electric (2600 shp)
Bunkerage	580 tons diesel oil
Range	20,000 nautical miles (37,000 km) at 10 knots surfaced 60 nautical miles (110 km) at 3 knots submerged

The I-6 was a further experimental development of the J1M (J2 class) long-range cruising submarine (Junyo sensuikan). She was completed at the Kawasaki yard in Kobe in 1935 and seems to have retained her seaplane facilities (a deck tube for the seaplane and an aft catapult) throughout her career.

She was deployed east of Oahu when war broke out, and put a torpedo into Saratoga on 11 January 1942, putting the carrier out of action and ensuring she would not be available for the Coral Sea and Midway operations. I-6 went missing on 30 June 1944 off Saipan , likely a victim of friendly fire following a collision with Toyokawa Maru.

References

Boyd and Yoshida (1995)

Carpenter and Polmar (1986)

CombinedFleet.com (accessed 2008-3-24)

Jentschura, Jung, and Mickel (1977)

Worth (2001)

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I-6, Japanese Submarine