Unfortunately even the tricks here don't accurately represent "decks awash". It shouldn't affect your fuel at all, because it's too dangerous to use the diesels in that condition, and the game thinks you're still surfaced and won't let you use batteries. The purpose of decks awash was to allow a silent and much less visible approach to an attack. They didn't drive around all over the world like that.
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“Never do anything you can't take back.”
—Rocky Russo
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