The gasbag has exploded. The blast wave has displaced portions of the first eight smoke trails and the shock front is seen against the canvas sail behind the illuminated pressure transducer pole. DM&A analyzed the motions of the smoke trails and the shock front to determine the energy yield of the gas mixture (equivalent to that of approximately 20 tons of TNT) and to compare the blast waveforms with those of other conventional high explosives, like TNT. This test was done to simulate the blast wave from a nuclear explosion at a time when atmospheric nuclear testing had been banned in most countries.