[KaleunMarco]

Originally Posted by Arlo

Finally found the quote (2nd hand) of Lockwood mentioning observing a test of a submarine decoy at Pearl Harbor:

"While at Pearl Harbor on April 19th (1945), I took advantage of the opportunity to see test runs of a secret decoy intended to aid submarines in evading counterattacks by escort vessels. Skate and the destroyer escort, Whitman put on the show and, after the submarine acquired the proper technique, she succeeded in eluding the DE in both of the final runs. This was the gadget which I had first seen operating in a fresh water reservoir in August, 1944, and for which we had been praying ever since Its use in enemy waters might have saved the lives of hundreds of submariners and millions of dollars worth of submarines."

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Japan surrenders on Aug. 14, 1945

He's not talking about general deployment on U.S. submarines during WWII.

yeah, they never really made it out into combat.
it was one of things that Lockwood really agonized about. Felt one or two defensive weapons could have/would have saved boats and crews.
this and the verdammt torpedoes for the first two years of the war. "it is a damn shame that our valiant crews have to sail five thousand miles just to find out that their torpedoes don't work."
but that is another story.