our government minders are taking us from north korea's capital, pyongyang, to the coastal city of wonsan. our 125-mile journey on this bumpy road takes almost five hours. we've been driving for a couple of hours through the countryside, and we've just gotten stopped at a checkpoint. already several minutes now, our minders are speaking with the police officer. not sure what's happening, but he doesn't seem to want to let us pass. travel here is restricted, and getting stopped can be nerve-racking. but we're finally allowed to pass. it turns out the concern this time is only about our big van disturbing the road work ahead. driving on, we see men and women laboring in dark tunnels.