May 12, 1943. North Atlantic. An RAF Liberator spots a German U-boat on the surface. The submarine crash-dives. But instead of dropping blind depth charges, the pilot releases something new.
A short, fat torpedo that can hear.
It’s called FIDO. Built from telephone switchboard parts, powered by a washing machine motor, and so secret that no wartime photographs exist. This is the story of the world’s first acoustic homing torpedo — the weapon that followed the sound of a submarine’s propellers through the dark water until it struck.
Credit to : Hidden H
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