Just before midnight on February 13, 1950, three engines of a US Air Force B-36 intercontinental bomber caught fire over Canada's northwest coast. The crew jumped, and the plane ditched somewhere in the Pacific Ocean. The fact that the huge aircraft had been carrying a Mark IV nuclear bomb was kept carefully hidden. Three years later, the wreck of the bomber was found by accident in a remote location in the coastal mountains of British Columbia, three hours' flying time in the opposite dir...