Satellite data backs theory of North Korean nuclear site collapse
Whether underground cave-ins have made the facility unusable is unknown
![satellite image of North Korea's nuclear test site](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/05/051018_MT_north-korea-nuclear-test_feat.jpg?fit=860%2C460&ssl=1)
I SPY Satellite images and seismic data reveal underground cave-ins at North Korea’s nuclear test site, but it’s unclear whether that has put the facility out of action.
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