If the magnitude stays at 5.2, this would be the same size as the Kim-5 in September 2016, which was a few tens of kilotons. 1/
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Perhaps. Six fission bombs spaced half a mile apart, all that hard? Might explain tunnel collapse. Thanks for feedback....
Anyway it seems like kind of a stretch to avoid admitting that DPRK probably has managed what many other nations managed decades ago.
