"Scientists from Beijing believe the Punggye-ri nuclear facility is unstable and that just one more explosion could blow the top off of Mount Mantap, beneath which all six of North Korea's nuclear tests thave been conducted.
That could lead to the mountain collapsing, causing radioactive waste to escape and blow aross the border into China just 50 miles away.
Researchers from the Chinese Academy of Sciences’ Institute of Geology and Geophysics warned Pyongyang delegates of the risk during a briefing in Beijing soon after North Korea's last nuclear test on September 3, according ot the South China Morning Post."
http://www.express.co.uk/news/world/872394/north-korea-news-china-warns-kim-stop-nuclear-tests-punggye-ri
That could lead to the mountain collapsing, causing radioactive waste to escape and blow aross the border into China just 50 miles away.
Researchers from the Chinese Academy of Sciences’ Institute of Geology and Geophysics warned Pyongyang delegates of the risk during a briefing in Beijing soon after North Korea's last nuclear test on September 3, according ot the South China Morning Post."
http://www.express.co.uk/news/world/872394/north-korea-news-china-warns-kim-stop-nuclear-tests-punggye-ri