In RL this behavior was caused by small leaks produced by various causes, damages etc. in the lower part of the hull ( italian "sentina") Also in Das Boot, Buccheim wrote that even during the dive, the U boot had to expell water in excess from the boat
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"When we realized that our clubbing and kickings were being administered by the burned, mutilated survivors of our handiwork, we found we could take it with less prejudice." Captain Richard "Dick" O'Kane-USS Tang
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