After thousands of underground testings, the ground in Nevada looks a little like Swiss Cheese. The ground has been poxed and still shows the signs of the underground detonations. Underground testing often leaves visible evidence on the surface in the form of subsidence craters in varying dimensions. Subsidence craters are depressions on the surface that occur when the roof of the blast cavity collapses into the void left by the explosion. The size of the subsidence crater depends on the yield of the device, the depth of emplacement, and the geological characteristics of the surrounding soil.
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