[the dark knight]

What I do, if it is early war and something pitiful like a swordfish I will shoot it down. My flak gunners are good, and will always kill a swordfish on its attack run. If it is a bigger plane, I will try to discourage it, fire upon it, maneuver at flank, and after he passes over me, then I crash dive to 60m. That way once he is turned around, I am long gone. Later in the war, if I have the long tower installed, and it is a lone plane, I might fight it out, but most of the time I will crash dive on first sighting. Remember, planes carried depth charges that had a maximum of 50m fuses on them (I think it was more common for them to have 25M fuses). Anything deeper than 50m, you should be okay.