In early September, North Korea detonated nuclear device under a mountain that has been assessed to have been a hydrogen bomb about ten times more powerful that the first atomic bombs dropped on Japan during World War II.
Japanese media reported that a tunnel has collapsed at the North Korean test site at Punggye-ri in the northeast region of the country, killing 200 people. The area has suffered many landslides since the tests were conducted, and the region experienced seismic aftershocks which were also considered to be the after effects of the nuclear test.
The workers in the tunnel might have been cleaning out the tunnel when the incident occured. Hazardous radioactive material could spread across the region, increasing chances of international incidents of radioactive damages.
