covering this. dan, they've been going back and forth over and over again to tehran. what's going on there? >> yes, in fact there's a pattern where they've been flying to dubai and return to tehran in a few hours. this is the pattern of basically carrying cash for the north korean regime, that's the suspici suspicion. >> and that cash is financing the scheme. this details the ship to ship transfers. hugh griffiths, who we interviewed yesterday, said in 15 years of working for united nations investigators, has never seen anything like this, where they're repainting the hulls of the ships to make them look panamanian rather than north