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North Korea’s mountain mystery: Is Punggye-ri Nuclear Test Site still functional?

In upcoming talks between the United States and North Korea, one of the key details is a mystery at a 7,200-foot-high point in the country’s north: Mount Mantap. This mountain hosts part of a facility, Punggye-ri, that has been the site of all six of North Korea’s nuclear weapons tests. The most recent test, carried out underground on Sept. […] WorldViews

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