David Stubblebine. By definition, a midget submarine is less than tons, has a crew of no more than eight, has no on-board living accommodation, and operates in conjunction with a mother ship to provide the living accommodations and other support. The Japanese Navy built at least midgets in 7 classes, but only a fraction had any noticeable impact on the war. Their intended purpose initially was to be deployed in front of enemy fleets, but their actual use would be in harbor attacks and coastal defense.
A midget submarine is any submarine under tons, typically operated by a crew of one or . Most German midget submarines were developed late in World War II in an attempt to stop the Allied invasion of Europe and used later to disrupt . The Type A Ko-hyoteki class was a class of Japanese midget submarines (Ko- hyoteki) used during World War II. They had hull numbers but no names.
It was substantially larger than the original Chariot manned torpedo. Known individually as X-Craft , the vessels were designed to be towed to their intended area of operations by a full-size 'mother' submarine - usually one of the T class or S class - with a passage crew on board, the operational crew being transferred from the towing submarine to the X-Craft by dinghy when the operational area was reached, the passage crew returning with the dinghy to the towing submarine. Once the attack was over, the X-Craft would rendezvous with the towing submarine and then be towed home. The weapons on the "X-Craft" were two side-cargoes - explosive charges held on opposite sides of the hull with two tons of amatol in each. The intention was to drop these on the sea bed underneath the target and then escape.