Nevada test Site, August 7, 1957. The tail, or “After” section of a U.S. Navy Blimp is shown with the Stokes cloud in background. Blimp was in temporary free flight in excess of five miles from ground zero when collapsed by the shock wave from the blast. The airship was unmanned and was used in military effects experiments on blast and heat. Navy personnel on the ground in the vicinity of the experimental area were unhurt. On ground to the left are remains of the forward section.