Experts fear that if the regime continues to test weapons at its North Hamgyong province there will be a major disaster that would have deadly consequences.
Paik Hak-soon, a senior researcher at the Sejong Institute, said the “possibility of a radiation leak there is growing”.
On September 3, North Korea tested what it claims was a hydrogen bomb, making it its sixth and most powerful test to date.
Hans Kristensen, director of the Nuclear Information Project at the Federation of American Scientists, warned the test explosion are significantly bigger than seen before.
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“If the mountain collapses and the hole is exposed, it will let out many bad things”
He explained: “The ranges I hear are from 100 to 250 kiloton, depending on who you ask.
“That’s a significant increase from the 10 to 20 kiloton [explosion] they had in previous tests.”
China has said the tests pose a “huge threat” top the region in terms of a possible radiation leak.
Wang Naiyan, a nuclear weapons researcher in Beijing said: “We call it taking the roof off.
”If the mountain collapses and the hole is exposed, it will let out many bad things.”
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And another researcher said a leak is “inevitable”, adding it is just a matter of time before it is detected.
The warning comes as the UN voted unanimously to impose sanctions on North Korea that are designed to strangle its economy.
It is hoped that by cutting off resources and money, Kim Jong-un will be forced to play ball with the international community.