USS Oklahoma (BB 37), showing extent of torpedo damage, after being righted. Evidence suggests possible mini submarine strike using larger Type 97 torpedoes (800lb TNT equiv. warhead), compared to the Type 91 aerial variety (450lb).
On the island of Kiska, Alaska, an abandoned Japanese midget submarine has lain silent in the grass that has consumed its former launch facility for decades. The abandoned wreck is now part of a Pacific war memorial.
7 December 1941. A Japanese midget submarine after having been raised by the U.S. Navy at the Pearl Harbor Navy Yard in December 1941. This submarine had been sunk by USS Monaghan (DD-354) in Pearl Harbor.
In a drydock at Kure Naval Base, Japan, 19 October 1945. There are at least four different types of midget submarines in this group of about eighty-four boats, though the great majority are of the standard