They could also be shooting at what they think is a parascope. I know when I was just figuring out convoy attacks while submerged I used the parascope alot and got that thing shot off a few times. I know some times the escorts get spooked and will start droping depth charges on "suspected enemy positions." Perhaps they will shoot at them too?
The only other thing that comes to mind is perhaps your bridge was poking out of the water if there was a storm going on. I have had my position given away a few times that way. It would have to be a hell of a powerful storm to get 15-20 meter seas. But if it did hapen some how I could see them shooting at you with the deck guns.
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