It is not clear from the public record how successful the Shrimp light pipes were. The unmanned data bunker was far enough back to remain outside the mile-wide crater, but the 15-megaton blast, two and a half times as powerful as expected, breached the bunker by blowing its 20-ton door off the hinges and across the inside of the bunker. (The nearest people were farther away, in a bunker that survived intact.)Dr. John C. Clark, as told to Robert Cahn, "We Were Trapped by Radioactive Fallout", The Saturday Evening Post, July 20, 1957, pp. 17–19, 69–71.
