Wasn't one of these type planes on the Japanese drawing board in WWII?
I believe there were actually a few kamikaze aircraft launched from Japanese subs toward the end of the war - can't remember how successfully.
They had a sort of watertight shed on the foredeck of the sub; after surfacing they'd roll out the plane and launch it from deck rails - I think it had sort of a little cart under the plane that would drop off after launch.
All from memory (History Channel show?), so may be utterly wrong. I think it was one of those "Secret Aircraft of WWII" type shows.