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Originally Posted by Albrecht Von Hesse
Moreover, during the first part of the war, the Japanese tended to set their depth charges too shallow, unaware U.S. submarines could dive below 150 feet (45m). Unfortunately, this deficiency was revealed in a June 1943 press conference held by U.S. Congressman Andrew J. May, and soon enemy depth charges were set to explode as deep as 250 feet (76m). Vice Admiral Charles A. Lockwood, COMSUBPAC, later estimated May's revelation cost the navy as many as ten submarines and 800 crewmen. (from Wikipedia)
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There's nothing in there that states that U.S. submariners knew that the Japanese depth charges could only be set that deep. They probably knew they could go deeper than the charges, but exact information isn't always available. I'm pretty sure the Germans had some idea too, but exact knowledge? I don't know.
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Originally Posted by Albrecht Von Hesse
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Originally Posted by EoE
I seriously doubt that the Japanese thought US submarines could not dive below 45 metres.
rgds/EoE
Then you're seriously wrong, as that's a historical, documented fact.
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Yep; even the deep ones could only be set for 30 or 60 meters.
http://www.navweaps.com/Weapons/WAMJAP_ASW.htm