Figure 5. The spoil pile continued to expand through late-2015 in advance of the first of two underground nuclear tests in 2016 involving the North Portal, while another tunnel began to be excavated nearby at the new West Portal.

Figure 5. The spoil pile continued to expand through late-2015 in advance of the first of two underground nuclear tests in 2016 involving the North Portal, while another tunnel began to be excavated nearby at the new West Portal. Image © Google Earth 2017.

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