guys. let s go to south korea now. there is a major rescue operation happening after flash flooding trapped more than a dozen cars and a city bus in a tunnel on saturday. more than 400 workers and divers are on the scene searching for survivors. so far they have pulled seven bodies from vehicles trapped in the flooded underpass and today crews are hoping to drain the water out of the trouble. mark stewart joins us now. more than 400 workers, it sounds like a pretty big operation. how s it going? what s the latest here? reporter: look, this is a very tough operation. we are now into hour 13 of this rescue effort. these crews are facing a lot of obstacles. first of all, they are dealing with the torrential rains. they have been dealing with mud. and then they have had to come up with a way to try and drain the water from the tunnel. as you can see from these pictures, this is a pretty