Perhaps I was too immersed in my immersion? Perhaps I had some hull damage? but the best way to know is run a deep drill near crush depth and gather data. In RL I know that is an issue and in game I have experienced exactly what I suggested on at least 2 patrols. The precise conditions I cannot recall and I am not a computer programmer LOL. I run RL commercial submersible ops! Keep us posted fellas and I will immerse myself in my glug glug fantasy world! LOL I love this sim!!
PS: I have not read in the documentation either but your boat will drift in current / wind when shut down and will not hold course if you do not plot it and just use the compass - so my imagination sez she is being 'set' * by wind and waves ... (nautical term as in being carried or offset by current or wind). I have run on multi-million dollar simulators where wind and waves will cause nav issues. I believe that the brilliant programmers may have it in their script ... somewhere.
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html