they also used the 2 man midget sub.unsuccessful as well. they launched 5 or 6 of these early on the morning of the Pearl Harbor attack. all have been found except 1. these were not suicide. but carried 2 torpedo's for attack then returned to the mother sub. none made it. one was discovered On August 28, 2002. amazing photos
The bow of the midget sub with the two torpedoes intact
photos