Scoop said:My bet is their test was a real nuke, but they failed to construct it properly to get the full yeild. Things have to be pretty precise to have full fission of all the material.
I am believe you would be able to detonate ANFO all at once.
I don't think that is what the N. Koreans did but it is a possiblity. ANFO could have been easily disguised in cement trucks. Easy to make, easy to use. Used all the time in mining because it is stable and conforms to the shape of the drilled cavity.