Harbor raids: if I TP a ship and it bottoms still above water, how do I get a kill?

[crazypete]

I found a wonderful illustrious class carrier sitting in loch ewe and put 3 fish into it, magnetic detonations with torpedoes passing down the bow to the stern. 2 shots in the front and one near the rear. It settled to the bottom of the harbor. No credit awarded. I cant shoot anymore at him because he is facing me head on so impact wont work on his bow.

Reloaded. Tried again. I usually dont reload like this but I was peeved. Same thing.

Third try, same thing.

So it seems like carriers are invicible cause they cannot sink below the water in the harbors!

Playing GW's.