This image was from the U.S. government after testing of what I assume to be an atomic blast. Here was the caption that was with it:
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. On ground to the left are remains of the forward section.