The Jornada Del Muerto, the Dead Man’s Trail, a waterless seventy-five-mile stretch of alkaline desert in southern New Mexico north of Alamogordo, was named in an age when transportation depended on water and grass, rather than refined hydrocarbons. In secrecy, in the spring of 1945, the last year of the Second World War, dedicated and determined men moved equipment into that emptiness to prepare to conduct the largest physics experiment ever attempted up to that time.