It was the most audacious plan of the West in the Cold War, to tunnel beneath the boundary between East and West and steal information from the Soviet's own telephone line. In this concluding episode, discover the true story of spies, espionage, deception and traitors in a whirlwind adventure into the acts that defined the Cold War. 

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Achtung! History is produced by The Berlin Tour Guide and presented by Simon J, James. You can follow Achtung! History on Twitter, Facebook and Instagram.