Mr Quatro is thinking of the Manitowoc Shipyard on Lake Michigan they built some of the Gato and Baolos there.The Navy would run their acceptance trials on Lake Michigan.These subs where never inteded to patrol the great lakes they just where built there.
According to "The Fleet Submarine in the US Navy" in order to compensate for the lower density of fresh water they where ballasted.In other words they added weight that of course would later be removed.That was done because they where trying to simulate the higher deisty of sea water without having to change the performance of all the pumps.If a sub where designed for fresh water it would need faster pumps.
Manitowoc boats where the best finished boats of any yard that made subs during WWII.That was due to worker pride and craftsmanship or really craftswomanship because most Manitowoc workers where women.
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