2017 North Korean nuclear test Scientists from the University of Science and Technology of China state that North Korea's nuclear test site, the Punggye-ri Nuclear Test Site at Mount Mantap, would have collapsed just minutes after the country performed its sixth nuclear test and opened up a hole of up to 656 ft in diameter. It has been one of the possible reasons given for North Korea agreement to suspend nuclear and missile tests. North Korea's Most Recent Nuclear Test Collapsed a Mountain © Fortune Sources: Fortune
