[Skubber]

This is an interesting topic, because in the actual U-boat handbook given out to skippers. the instructions for dispatching enemy ships with the deck gun strongly emphasize setting fire to the deck.

Well, to be more accurate, using the U-boat as a gunnery vessel is strongly discouraged by U-boat command, but under ideal conditions it may be used, and in order to sink a ship it says "the deck must burn".

So it would seem accurate if that was modeled into the game.