Robert A. Link
"...Early in the war there was a fact finding commitee that the congressmen sent out to the Pacific...
...and when they got back, one of them made the remark that our submariners didn't have anything to worry about that the Japanese weren't setting their charges deep enough...
...Well, the Japanese can read too and I believe Admiral Lockwoods figures on that were...in the next 6 months we lost 10 submarines cause they just started setting their charges deeper."