Bilby’s subsidence¬†crater resulted from a 249-kiloton atomic test, (equivalent to over 200,000 tons of TNT) which occurred on September 13, 1963. The crater is 80 feet deep and 1,800 feet in diameter. Monitoring apparatus (see photos below) record the residual levels of radiation in the weapon chamber and in the groundwater.

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Radiation monitoring apparatus sits at the bottom of the Bilby subsidence crater.

Radiation monitoring apparatus sits at the bottom of the Bilby subsidence crater.

A tag on the pipes controlling the flow of water and gases from beneath the crater indicates the level of radioactivity.

A tag on the pipes controlling the flow of water and dissolved gases from beneath the crater indicates the level of radioactivity.

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