Sunderland are very dangerous at the beginning of the war but for some reason they try to depth charge me while I'm on the surface when they have depth charges, I guess they try to drop them on my deck!
AoD also masters the art of realism when it comes to aircraft tactics, small planes (F4 wildcats mostly) will, once they have you spotted, overfly you once or twice to make a few holes and then fly around you at the limit of your AA gun's range and call in a destroyer. Then two different scenarios may happen:
1)You submerge and try to escape at flank speed (unlikely if the destroyer is already chasing you).
2) you stay surfaced and face the destroyer but then proceed to diving, receiving a few wados in the process.
Also to avoid damage from the aircrafts bombs/gunning overflys:
-I usually travel at full speed and then crank it up to flank when the aircraft is closing in (~500m)
-I do "drastical course changes" of 90°+ when the aircraft is closing in too (same~500m)
Hope this can avoid you a lot of work for the repair party!