Ok - so, why didn't Uboat crews use the AA guns and shoot down more enemy aircraft? Fer cryin out loud - later in the war, you can have freakin 4 20mm canons and 2 37mm canons - MORE than enough to easily dispatch one freakin airplane.
Just because they didn't shoot them down didn't mean they couldn't or it was such an insane problem!
Please, educate me!