While we're talking about things that go in and out of the water, I would like to reintroduce one of my favorite never built ideas; the ballistic torpedo. A ballistic missle is fired at a ship/s and when it reaches its terminal phase, just before hitting the water, it relases MIRVed water-borne torpedos, dropping them from the air into the water where they independently target the ship/s. It solves the problems of a ballistic missle's inaccuracy and the fact that a torpedo needs to be brought very close by its launch platform, be it a sub or a helicopter or a plane. Its a carrier killing weapon, so I guess its not too off topic.
Any comments on fesability?