Figure 3. Coincident with, or shortly after, radionuclides were detected and traced back to the February 2013 test, a new tunnel began to be excavated from the same point as the previous tunnel at the North Portal.

Figure 3. Coincident with, or shortly after, radionuclides were detected and traced back to the February 2013 test, a new tunnel began to be excavated from the same point as the previous tunnel at the North Portal. Image © Google Earth 2017.

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