Prevention measure to keep gun crew from injury

Noted that even while submerged, if the deck guns are damaged, so are the people who man then (even while safely inside the sub).

Was going to try something to prevent that, just wanted an opinion on it:

Remove 3 people from DC team, and put those three guys in there instead (two for the deck gun, one for the AA).

If they're not in those slots, they shouldn't be injured while submerged right?