File:Underground Testing at the NNSS – Subsidence Crater Formation 1.jpg
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![File:Underground Testing at the NNSS – Subsidence Crater Formation 1.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/Underground_Testing_at_the_NNSS_%E2%80%93_Subsidence_Crater_Formation_1.jpg/300px-Underground_Testing_at_the_NNSS_%E2%80%93_Subsidence_Crater_Formation_1.jpg?20120914005509)
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