Most atom bombs have been exploded well above the ground, either perched on a tower or dropped from an airplane.
Last week on its Nevada proving ground the AEC tried something different: it exploded an underground bomb, its first subsurface bomb since a little-publicized experiment in 1951.
The bomb, of unusually low energy yield because of the unusually high hazard, was buried in the earth at an undisclosed depth. When it exploded, it gave little light, heat or blast, but it raised into the air a many-fingered fountain of dirt or shattered rock. Most of...
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