File:Underground Testing at the NNSS – Subsidence Crater Formation 4.jpg
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![File:Underground Testing at the NNSS – Subsidence Crater Formation 4.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/38/Underground_Testing_at_the_NNSS_%E2%80%93_Subsidence_Crater_Formation_4.jpg/304px-Underground_Testing_at_the_NNSS_%E2%80%93_Subsidence_Crater_Formation_4.jpg?20120914005511)
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