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Originally Posted by Beery
My point was simply that without any means of giving the sub positive buoyancy it would sink. submerged U-boats, if they are without ballast, are heavier than the water around them.
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If they are without ballast? Without compressed air, you mean? Because you can't get a sub lighter than having no ballast - and I've been able to surface without blowing ballast tanks and with no propulsion.