An abandoned eerie structure in France could have doomed the Allies in World War II, and new discoveries at this mysterious site reveal the truth behind top-secret Nazi plans to unleash apocalyptic destruction. Germany built the Blockhaus d'Éperlecques between 1943 and 1944 to serve as a launching pad for V2 missiles targeting London and southern England. Severe damage from heavy Allied bombing prevented its completion.

New discoveries on the Channel Island of Guernsey, strangely fortified by the Nazis, reveal the terrifying truth behind Hitler's secret plan to win World War II at all costs, and using the latest science and tech, experts investigate what really happened here.