Quote:
Originally Posted by Fifi
Exactly 
Same testimony in Iron Coffins by Werner ... adding Brits deployed noise buoys all along Great Britain, simulating ASDIC sounds and depth charges explosion noises to discourage U-Boats from entering zone! |
Yep, they had another noise maker that was used to confuse acoustic torpedoes.
"Unknown for reason" depth charge noise being picked up by u-boat crews during the Inshore Campaign is mentioned in Stiebler's book on the subject.