SS vs SS warfare usually seems to involve both SS sitting in crit dive until their torps reload, then coming back up and waiting for the other sub to come up, firing, and submerging again. The victor comes out severly lacking in air, and the loser comes out with very small amounts of attack. Even more broken is that it essentially comes down to who reloads faster. It especially hurts SS 1,2, and to a lesser extent 3, because by the time they're done they're at half health from crit diving and almost out of air. I'm not sure what can be done to fix it, I'm not a game designer, but I do know something needs to be fixed because in its current state, SS vs SS is just not fun unless you somehow manage to get into a real duel, and even then lower SS get screwed because they won't have enough air to do any real damage after that.