I know in vanilla SH5 they wouldn't man the deck gun if the deck was underwater. In some cases in rough seas (if the deck wasn't constantly awash but occasionally underwater) the deck gun would be 'manned', but the gun would only fire if the deck was above water. Alternatively, so long as you were 'surfaced', you could run down and man the gun yourself and fire regardless of whether you were 10 ft underwater or 10ft above it
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