National Geographic News


This is the north end of Yucca Flat where most tests have been conducted. When atmospheric tests were banned in 1963, nuclear testing moved underground. The subterranean explosions left saucer-shaped craters varying in diameter and depth, depending upon the yield, depth of burial, and geology. The landscape created by these explosions was considered so moon-like that it was used for training the Apollo astronauts for their moon walks.

Photograph courtesy of National Nuclear Security Administration

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