Nuketown nevada usa wikipedia biography

Hole or depression left on the surface over the site of an underground explosion

A subsidence crater is a hole or depression left on the surface of an area which has had an underground (usually nuclear) explosion.

Many such craters are commonly present at bomb testing areas; one notable example is the Nevada Test Site, which was historically used for nuclear weapons testing over a period of 41 years.

Subsidence craters are created as the roof of the cavity caused by the explosion collapses.

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This causes the surface to depress into a sink (which subsidence craters are sometimes called; see sink hole). It is possible for further collapse to occur from the sink into the explosion chamber. When this collapse reaches the surface, and the chamber is exposed atmospherically to the surface, it is referred to as a chimney.

It is at the point that a chimney is formed through which radioactive fallout may reach the surface. At the Nevada Test Site, depths of 100