1 - Defending Subs are allowed to submerge after first round of combat even with enemy destroyer(s) present. Basically, the attacker gets to roll with whatever he/she is attacking with, including aircraft of course. If they score hits on the subs, then tough luck. If they miss some/all of the subs, then the subs can submerge and escape the battle. I get the idea of destroyers cancelling the first strike capabilities of subs and spotting them for aircraft attack, but I have never liked the idea that a sub is “trapped” and can’t submerge just because an enemy destroyer is present. In reality, subs COULD still evade destroyers, it was just a little harder. Plus, I don’t like the idea of a single destroyer showing up with 10 fighters to wipe out a stack of subs. That just doesn’t seem right to me.
HI KNP
You should take a look of A&A realism enhanced rules from R.D.Baker, you’ll find cool rules about Sub and others warships.