North Korea’s Nuclear Test Site Is Largely Unusable, Chinese Scientists Say

Pyongyang’s last blast rendered part of the site unusable and a new test would cause an ‘environmental catastrophe’

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BEIJING—A large part of North Korea’s underground nuclear test facility is unusable due to the collapse of a cavity inside the mountain after the latest test-detonation occurred, according to Chinese seismologists involved in a soon-to-be-published study.

The experts, led by researchers at the University of Science and Technology of China, warned that another blast in the same spot and with similar yield to the one on Sept. 3 could cause “environmental catastrophe.”

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