So how much do you know about the old bunker and its vitally important function during the darkest days of World War Two?

The German High Command called it “Operation Paukenschlag” or Operation Drumbeat. Not wishing to be outdone by the Japanese bombing of Pearl Harbor, on December 11, 1941, German Chancellor Adolf Hitler ordered his most fearsome and silent fighting force to sortie into the Atlantic Ocean off the coast of North America.