I havent tried the XXI in single missions, but i have experienced a minor bug: Before i start my patrol in the campaign mode (when i use the XXI), i get a report that the main pump is destroyed. It occurs when the loading screen turns into the game screen. Its at the same moment the sonar gets destroyed on the VIIC.... I dunno whats going on.. IIRC, it happends in the GW and in the NYGM mod. Not a big problem though, since my crew is well trained and has been out a winter night before, but ...:hmm:
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