Hull repair only works when out of combat, in combat nothing happens, and you used the skill up.
I dont know if this intended, but it doesnt say anythin in the discription that it only works out of combat so im posting it here.
Also found a a bug where i can fire 28 torpedoes at once (screenshoted it)
I was unable to reproduce this, but i manage to reproduce 6 torpedo salvo.
(for safty reason i will not post here incase of abuse)