From what I've seen the game AI is pretty spot on with GWX. In the early years the DD's would maybe drop 3 sets of charges then give up. As the months go by they become more aggressive and are more willing to stay and see the job done. Once the American convoys start moving east in 42, they almost always have spare escorts to drop off and hunt you down, I just finished shaking off 3 destroyers trying to take down my IXC and just barely made it out in one piece. The only thing you can do is go silent and go deep, with the Alberich skin on my boat the pinging stops around 90 meters, and I always try to keep my ship in their baffles. When they turn away from you, change course they usually end up loosing track of you if you make a series of changes over a short period especially if you do it behind them.
As far as being realistic, I was listening to some of the U-boat survivors talking about getting depth charged the other night. One said around later 42 they got detected at night and the destroyer kept them down for 36 hours before they finally broke off. Johnny Walker lit a fire under those boys, when he died they were out for blood.
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