It's my 9th patrol and i am using the same U-boat, the IID, i have promoted some men but no upgrades so far. The date is mid of May of 1940. So i think it's a bug and a first time that happened to me.
About the hydrophone operator, it makes sense what you state, the sea is rough and we occasionally go at 10 meters underwater even when sailing with the engine and not the batteries.
Thanks for your replies.
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