[Moonman62]

Right after the "test," NK made a big deal about saying all radiation was contained. That tells me it was probably a fake done with conventional explosives.

[Attention Surplus Disorder]

Problem is, there's really no way to know or tell if any assertion, by either side in this whole thing is true or false. NK's assertion that no radiation escaped could just be more bluster pimping their self-proclaimed tech expertise, or it could be just true. I don't know how we can know.