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Besides that it was doctrine to only use FIDO's in deep water away from shallows or a coastline in order to avoid a dud falling into German hands. They -literally- never knew what hit them.
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That is precisely the fundamental point here
There are no known records that indicate the Germans knew of the existence of Fido!!
How long did it take them to begin realising that most convoy reports still amounted to wild goose chases because the convoy changed course after it was discovered.....or that their enigma code had been compromised ? :hmm: