I'm not sure how the game handles the boat's radar profile, but it does allow for faster diving if you are spotted. But it would be unrealistic to do so, though, as in real life running decks awash was only done using electric engines for a silent approach during a surface attack, and then only in calm seas.
Even if the boat can do it by venting the diesel exhaust through the conning tower, the boat's speed would be reduced because the bow is designed for sea cruising whereas the conning tower is not.
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