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Originally Posted by Beery
I think if a U-boat had no propulsion (or too little) and no compressed air it would almost definitely sink.
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I don't see why the amount of compressed air would affect buoyancy. When one spends compressed air to blow the ballast tanks, it is not replaced by anything heavier. Even air has positive weight, and is certainly heavier than vacuum. Having no compressed air left would therefore make the sub lighter, though not significantly.