so there is some kind of device. but that is very different from militarization and delivery and from tested delivery and other things. >> so most of what we know about this isolated country comes from those who have been brave enough to flee. angus walker of itv news talked to one of those defectors about life inside north korea. >> under the cover of darkness, smugglers cross a frozen river from north korea into china. taking enormous risks and food and fuel back to their impoverished country. this was filmed a few weeks ago. the footage even shows an armed soldier who has been paid to cover their tracks at first light, bribing the border guards and following in the smugglers footsteps is how people escape from north korea. now, in hiding, in south korea, this woman defected shortly