Thank you very much!
This is very helpful.
I've suspected that this is the case. I've read at a few places, including the submarine commander's handbook, that uboats were detected extremely rarely on a surface. If you tell that even a moment of joy during a battle could be more or less fine, for at least some Kaleuns, I guess that we are going in a right direction.
In our game it gets noisy mainly during a patrol on a surface or periscope depth when literally nothing happens. There probably would be a minimal reasoning behind forcing the crew not to behave as they like in such situation.