The Confederate submarine H.L.Hunley did manage to sink the Union vessel Housatonic. Hunley itself sank more than once while in service—submarines are tricky in that way. It is a fine line between doing it on demand, or just because!
Hunley sank twice before it’s sole successful mission.
Hunley was hand powered. Was the Confederacy going to build a hand powered helicopter too.
“submarines are tricky in that way. It is a fine line between doing it on demand, or just because!“
Gotta keep that screen door on the submarine closed so it won’t sink. :D