Description:21 36 07 00 Yellowstone. Threat of earthquake, natural disaster. Collapse of fragments of air mountains, sight of mountains. Helicopters saved 300 campers. Evacuated wounded persons, close-up hurt on stretcher. Close-up badly wounded person with bandage. Help lower stretchers. Sight of a typical street of American town. Seen in shop or beams returned because of the shocks. Collapsed wall of house.