experts two weeks to carefully latex ploesi lay the explosives. >> it's not simple to employblop and make it come down. >> reporter: after surveying the rubble, they said the stage is now set for the next phase of negotiations, to fully dismantle this and hand over the plutonium, including the bombs it has produced. >> that was then, and that was it for plutonium processing, but two years later our guest was shown a new secret facility right there for enriching uranium, the other route to the bomb. at the end of last year, north korea fully and officially restarted the facility and it started this new year with a big and ominous bang. that's it for our program tonight. you can always listen to our pod