Good fun using this silly periscope depth SH3 tactic in AOD, see how long one can survive. Doing a 1941 attack now; first pass the corvette damaged my hydrophones for eleven hours, knocking them out until repaired.
Also knocked out my air compressor, repairs only at base, so if I blow tanks the air can't be replaced.
Have sunk two ships though, but the end is near for my sub.

No just waiting until the lead escort passes you by without noticing you ala SH3, in AOD.