North Korea nuclear test: No radiation detected
I don't remember if I shared my suspicion here or elsewhere a few years ago, but I can't help but think that all the posturing and playing with explosives is "Smoke and Mirrors". Does anybody actually, honestly, believe North Korea was ever in possession of anything but a truck load of TNT and a long fuse?
Look up articles about Messines Ridge in 1917 for similar effects (largest man made explosion at the time).