If doing the mission i'd want it to be a bit of a challenge so I personally wouldn't mind a long chase. Although I would really like AI subs in the campaign layer. It would obviously be rare to find them but is it at all posible to implement them into the campaign?
Same thing with giving allied ships the ability to find subs. It could cause bother if you were sunk by a friendly but it would be more realistic. You should know better then sneaking into friendly ports.
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