I'll try a different tack: The main points of decks awash are to lessen the chance of being seen and facilitate dive times. Using the deck gun seems to be contrary to both of those. If using the deck gun when decks awash it would probably be realistic to not push the dive button until at least 30 seconds after you were spotted by an escort, remembering that in real life you would also be running on batteries.
Now, how many recorded instances are there of a submarine using the deck gun while running decks awash?
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