Modern subs don't carry deck guns. Small arms are available to security crew including automatic rifles. Unless you are up against an ultralight with a hand gun, subs are not capable of serious surface to air encounters and will do everything to avoid it. In Dangerous Waters, subs could be equipped with stinger missiles which are still proximity line of site weapons, and the risk the sub and crew have to take to be in a position to use it is perilous. Against a trained and aggressive anti-submarine opponent, the sub will be the loser where even a small amount of damage to the bridge could seriously endanger the boat.
For the most part, surfacing is a death wish at realistic and above levels.
-Pv-
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