How a British Echo Trap Made 12 U-Boats Hunt the Same Phantom Convoy for 3 Days

In November 1942, British naval engineers deployed a secret acoustic device in the North Atlantic — a small cylinder that did nothing but make sound. The sound of an entire phantom convoy. Within hours, 12 German U-boats abandoned their hunt and began circling empty water for 3 days straight, firing torpedoes at ships that did not exist. This is the story of the most elegant deception of the entire Battle of the Atlantic — the British Echo Trap that turned sound itself into a weapon. #WW2 #BattleOfTheAtlantic #UBoat #WW2History #NavalWarfare #BritishMilitary #SecretWeapons #WW2Documentary #Kriegsmarine #RoyalNavy