the fact that north koreans would resort to such drastic measures for their freedom speaks volumes about the desperate situation that they're facing back home. >> definitely. i mean, in this situation, if they're caught and sent back to north korea, they'll face almost certain execution. at worst, they are going to be sent to a labor camp from where they will never emerge. they have a very, very bleak existence. this is why they go to that extreme to try to leave. >> one of the things that stuns me about north korea, i did a piece recently about camp 14 for "60 minutes," that in some camps they have three generations of punishment where they don't just punish a political prisoner, they also punish that person's parents and children. they want to wipe out three generations. i want to play another clip from your film "seoul train." a defector returns to north korea with a hidden camera to show how bad the humanitarian crisis is there. let's watch. >> many children suffer the most that will really influence their growth.