Hidden deep beneath the cliffs of northern France, the Nazis were constructing one of the most terrifying weapons ever conceived during World War II — the V-3 Supergun, also known as Hitler’s Doomsday Cannon. Unlike the V-1 flying bomb or the V-2 rocket, the V-3 wasn’t a missile at all. It was an enormous, fixed mega-cannon designed to fire explosive shells across the English Channel with devastating accuracy… straight into the heart of London. This wasn’t just another weapon. It was a 1,300-foo