Yes, but no XXI saw real battle action, so we donīt now if it had worked anyway. By the way, Padfield (War beneath the sea) mentions one successful sonar attack done by a US skipper. He also says that this was most probably the ONLY SUCCESSFULL BLIND SONAR ATTACK in the war that is known.
Cheers, AS
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Whenever people agree with me I always feel I must be wrong. (Oscar Wilde)
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