In the book Clear the Bridge by Richard O'Kane he states that while on sea trials he took the Tang down to 625+ feet. He mentions that the depth gauge pegged out at 600 feet.
While serving on USS Sandlance, SSN-660 the very first watch I stood was monitoring a pressure gauge in the Engine Room Upper level while doing angles and dangles. I was on sound powered phones and was required to read out the pressure at regular intervals during the exercise. Boring as hell and at the time I had no clue why I was doing it (backup to depth gauges up forward). So if WWII subs had pressure gauges it would have been easy for them to keep track of depth using pressure - someone could have just made a table that could have been read from.
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