Type A1 submarine

A1 Type submarines were submarines of the Imperial Japanese Navy during World War II, equipped with an aircraft. The design was an adaptation of the J3 Type design, with the hangar opening forward of the conning tower.

Three boats were built, and equipped with communication facilities allowing them to operate as the command ships for groups of submarines.


 * I-9 was sunk by destroyer USS Frazier in the Aleutians on 11 June 1943.
 * I-10 was sunk by destroyer USS David W. Taylor and destroyer escort USS Riddle east of Saipan on 4 July 1944.
 * I-11 disappeared off Ellice Island, today Tuvalu, on 11 January 1944.