Just as other ships may, submarines may also move out of a sea zone where they begin their turn with enemy ships, even destroyers. The destroyer doesn’t stop the sub’s movement, as the sub didn’t enter the sea zone - it started off there.
Just roll them all at once. As long as you use different colors for different attack powers (ie all 1’s roll white, all 2’s roll red, all 3’s roll blue and all 4’s roll yellow or something) or you just roll for each attack power separately, you are fine. No need to roll each individual bomber since all the hits total up at the end anyway.
It is driving me crazy that WOTC is keeping silent on this. This is Huge for us fans/players and seems very unfair. I visit their site EVERY DAY for more info.
And ofcourse AAA.org is the only place information can be found.
Thank goodness for this forum and thank you all who are keeping the community informed.