The mountain where nuclear bombs were tested from North Korea is threatened with destruction

The site of the nuclear bomb testing from North Korea, respectively, is at risk of collapse and radiation in the region.

Pyongyang organised his sixth nuclear test at its base on Sunday we leave behind, in an estimated underground explosion to be up to ten times more powerful than the device set up in Hiroshima.

US observers marked a powerful 6.3 magnitude earthquake in the vicinity of the main testing site of North Korea, the quake also felt in parts of China and Russia, with a shock possibly caused by a rocky cave.

Experts in China now fear that a mountain believed to be above underground chambers where North Korea has conducted all its tests is under threat of collapse.

Wang Naiyan, a former head of China's Nuclear Association and a researcher in China's nuclear weapons programme, says there is danger that in another test the mountain collapsed from a toxic radiation ray across the region.