Generally my experience is that aircrafts are still the greatest threat but it should be noted that I am running in a XXI and I am only attacking merchants sailing alone or in pairs in a relatively busy area. I am not actively pursuing convoys yet and steer clear of warships. I make sure I still have 75/80% battery charge even after I have put some distance from the sinking ships and I seldom use bottled oxygen, so I have plenty of both in case I get chased by surface ASW assets. So far it has happened only once and shaking them off has been relatively straightforward, though i must say watching Hedgehog in action is scary.
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