The full story of Saddam Hussein 's supergun is revealed. It began as one scientist's dream and ended in murder, illegal arms shipments, and serious embarrassment for the government. With previously secret documents and interviews with some of those most closely involved, Panorama shows how the Iraqis ordered three different guns, how British companies helped build the parts, and how confusion and rivalry in Whitehall nearly led to potentially lethal technology falling into Saddam's hands.