The Japanese Built Submarine Aircraft Carriers
In the field of aircraft carriers, the Japanese were pioneers. Japanese soldiers sought a strategy to outmaneuver American forces during the Second World War. Japan needed something surprising because the US was a strong foe with a larger force and more powerful weapons. They developed the I-400 class of submarines as a result.
These devices were gigantic, measuring 400 feet long and weighing 6.56 tons. They were built to fly three bombers 37,500 miles between refueling stops. The bombers were kept in a hanger that was 115 feet long and had an 85-foot catapult to launch them.
They equipped the bombers for water landing so they could maneuver through the confined confines. They may be retrieved and returned to the sub using a crane. To fit inside the hanger, the tail and wings were folded up together with the fuselage.
The war ended before any of the subs could reach their intended objective, and just two of them were ever launched. They had deviated from the rules of engagement by painting the bombers on board with US markings, and if things had turned out differently, they probably could have done a lot of damage before being detected.