The USS Salmon (Salmon class) went to 500 feet when depth charged by the Japanese (then battle surfaced!)-
http://www.subsim.com/radioroom/showthread.php?t=97573
And here's the link to the story of the USS Chopper (Balao/Guppy I)
http://www.usschopper.com/Chopper%20...e%20Report.htm
Yours, Mike