Mountain above North Korea's nuclear test site collapses leaving the site unsafe for further testing

Mail Online -

Mail Online—Chinese scientists say a test explosion involving Pyongyang’s most powerful device triggered four earthquakes over the following weeks.

North Korea collapses tunnels at nuclear test site: media reports. SEOUL (Reuters) - North Korea followed through on a pledge to blow up tunnels used for nuclear testing on Thursday, South Korean media reported, as part of steps that have reduced tension on the Korean peninsula and raised the possibility of a summit with the United States.