On May 12, 1943, in the perilous Atlantic waters, Kriegsmarine submarine U-456 vanished with all hands on deck. This opened up a mystery for the Third Reich, who, that month, suffered unprecedented U-boat losses.

Little did they know that a silent predator, a Liberator under the command of RAF Flight Lieutenant John Wright, had soared through the skies, armed with an enigmatic weapon - the Allies' best-kept secret.

Nicknamed FIDO for its dogged determination, this American-made creation was so covert that its use was confined to the deep open waters of the Atlantic to prevent it from running ashore. The directive was clear: release it only after a U-boat had dived or was diving with the conning tower hatch closed to keep the enemy from ever spotting this secret weapon.

Only after the war did Germany discover what was behind their submarines’ downfall.


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