“Japanese Type A midget submarine beached in eastern Oahu, after it unsuccessfully attempted to enter Pearl Harbor during the 7 December 1941 Japanese attack. The photograph was taken on or shortly after 8 December 1941.” (NHHC: 80-G-32680)
11 Old War Photos You Won't Believe Aren't Fake (Part 2)
At the end of World War II, Allied Occupation forces found hundreds of midget submarines built and building in Japan, including large numbers of the “Koryu” type. Many of these boats were in massed groups at shipyards and naval bases.
The Confederate submarine H.L. Hunley was the first submarine to successfully sink an enemy warship, sinking the USS Housatonic on February 17, 1864. The Hunley sank while returning to Charleston Harbor, after the attack. This submarine was one of as many as a dozen Confederate midget submarines that were completely or partially built during the war, but was the only one to be used in battle. Of interest is that the designer was from Ohio and only a third of the crew was Southern.