According to Padfield one of the best-kept secrets of the war was that the Balao pioneered the use of STS (armor) for the pressure hull. Another source (which I will supply this afternoon) states that they estimated the Balao and Tench classes would be good to 900 feet. No official verification, though.
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Originally Posted by WilhelmSchulz.
Both the Balao and Trench classes could make it to 600 ft. But only because thats how far the depth guage went.
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TENCH!