Go to Data/Submarine folder for each sub; find the Cfg file and change the Surfacedepth setting so it's deeper than stock. After that you can dive to that depth and it will think you are still surfaced. It's not really 'Decks Awash', since you can't run on batteries, but it's the next best thing.
If you're using NYGM you can just look; it's already done.
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