to the las vegas airport. >> as that shockwave went across the desert, anything its path was leveled, destroyed, disturbed. >> an investigation finds the fire is started by a welder's torch during maintenance and is spread by chemical residue that causes a fiberglass wall to ignite. the plant is rebuilt in utah and a power substation eventually takes its place in nevada. those that experienced the disaster firsthand will never forget it. >> the last explosion and the shockwave is burned into my brain forever. coming up -- workers moving a building run into serious trouble. and truckers make big mistakes. >> i'm thinking, what are you doing, guy? get out of there. >> when "caught on camera: total destruction" continues. it's a growing trend in business: