The three workers—Marvin J. Ehlinger, Hilary F. Huser, and Floyd T. Lutz—noticed the flames, ran out of the igloo, and jumped into a ditch across the road. The sphere burned for about forty-five seconds and then detonated, setting off approximately 123,000 pounds of high explosives in the building. The explosion did not produce a nuclear yield, although the mushroom cloud rising from the blast contained uranium dust. Shop windows were blown out in San Antonio, fourteen miles away. All that remained, where the igloo had once stood, was a crater twenty feet deep. The other igloos at the base
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