The USS Salmon was nearly destroyed on October 30, 1944 in an intense and accurate depth charging.The large tanker she damaged with two torpedoes(two others missed) was escorted by four Type C/D escort vessels which were first team, they damaged the Salmon severely, forcing her to the surface after sinking to 578 feet(test depth for that class is *250* feet.Nothing short of a miracle, Salmon battle surfaced her way to safety, killing multiple japanese on the deck of one of the escorts.The 10,000 tanker she hit with torpedoes and damaged, was slowed down by her hits and finished off by another sub later that night.
http://www.ibiblio.org/hyperwar/USN/...8/WDR58-7.html