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Originally Posted by AJ!
One can only hope 
"I don't see why not. They were identical to the late-model Balaos except for a better dive depth."
Was that the only difference? Why was the tower such a different shape?
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That was a post war expemant. The G.U.P.P.Y(Greater Underwater Propulsion Program). A program started to see if the Gato/Balo/Trench classes could be made to par with the type XXI U-Boat(ie. modernized)