The AEC's underground nuclear tests may not produce a fiery mushroom cloud but there is one above-ground effect that anyone can see. ] Shortly after each recent blast, a strange dent has appeared in the ground at the Yucca Flats, Nev., test center. Some of the depressions are only a few feet deep, but two of them are 50 ft. deep and several hundred feet across. The holes are not craters; nothing is blown out. There is no radioactivitiy, and the level of the ground around the depressions is not raised. But millions of cubic feet...
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