Bob Serber was also twenty miles away, lying face down and holding a piece of welder’s glass to his eyes. “Of course,” he wrote later, “just at the moment my arm got tired and I lowered the glass for a second, the bomb went off. I was completely blinded by the flash.” When his vision returned thirty seconds later, he saw a bright violet column rising to 20,000 or 30,000 feet. “I could feel the heat on my face a full twenty miles away.”
