Historical: 

A submarine aircraft carrier is a submarine equipped with aircraft for observation or attack missions. These submarines saw their most extensive use during World War II, although their operational significance remained rather small. The most famous of them were the Japanese I-400 class submarine and the French submarine Surcouf, although small numbers of similar craft were built for other nations' navies as well.

Most operational submarine aircraft carriers, with the exception of the I-400 and AM classes, used their aircraft for reconnaissanceand observation. This is in contrast to the typical surface aircraft carrier, whose main function is serving as a base for offensive aircraft.

Info:        IJN Submarine I-400 – 1945

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