defector describes as a 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? >> translator: smuggling is conducted by any means you can imagine. mostly done by ships, for example, by filing a cargo list from what's written is different than what is really being shipped. >> for decades, ri jong ho says he would sometimes hand bags of cash to ship captains. redefected in 2014, he says he worked mostly in legal imports and exports but gave us insight into north korea's smuggling operations which he describes as unstoppable. >> on the north korean sea, the yellow sea, there are hundreds of fishing boats, both from china and north korea.