On Tuesday, Japanese broadcaster TV Asahi reported that a tunnel collapsed at North Korea's Punggye-ri nuclear site, resulting in the deaths of more than 200 people. The cause of the collapse is being pointed at North Korea's nuclear tests that were conducted on September 10. Experts claim the power of the nuclear tests caused tremors and landslides that destabilized the area. Punggye-ri pay not be used for nuclear testing much longer.