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It was always my understanding that the crew would strive to keep the boat 'balanced' at all times so I don't think the boats came back 'lighter' at the end of their patrols. They would compensate for the lost weight of expended torpedoes, consumed food stores and fuel by pumping more water into the trim tanks/ballast tanks to keep the boat in balance.
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...I fought in many guises, many names, but always me. Patton
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