Quote:
Originally Posted by Iron Budokan
A quick calculation shows that a hundred pounds of potatoes is 0.05 tons. Seemingly nonexistent compared to the 865 tons of a submerged VIIC! That's only a difference of 0.0058% between stabilization and falling to crush depth.
Again....wow! 
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Neutral bouyancy is a delicate balance, even the salinity of water will affect it. Some U-boats in the Baltic had problems in the spring time when a lot of fresh water from the rivers ran into the sea.
When I had a sailboat in San Francisco Bay, when sailing up the San Joaquin river, my boat would sit a good 10 centimeters lower in the fresh water than at sea.