smuggling net worth. what have you learned, brian? >> reporter: we have information on how kim jong-un's regime gets weapons out to sell on the black market. this man knows how kim gets his money and helps him get it funneling tens of thousands of years to the young dig tctator. august 2016 a freighter is intercepted. underneath 2,000 pounds of iron ore, rocket grenades made in north korea. part of what is a spider web of smuggling to line the pockets of kim jong-un. how do north korean smuggling operations work? are there people with false names? are there ships with false names being moved around? >> reporter: the smuggling is conducted by any and every means you can imagine. larger items are mostly done using ships, for example, by filing the cargo list. where what is written is different than what is really being shipped. >> reporter: for decades, he was