nothing to worry about. but suddenly up river about noon it begins to pour. >> i was very concerned. and i kept telling mark that we should be out of there. >> at first, the water downstream is just a trickle. then jose and mark hear a dull roar. they look behind them, and see a seven-foot wall of water. >> it was like a brownish water with lots of trash in front of it. and i knew then that we were in trouble. >> the men race for their mixer, but water quickly floods the cab. jose and mark dart up a ladder to the top of the 20-ton truck, figuring it won't budge, they'll be safe. they're mistaken. 150,000 gallons of water a second are now rushing down the l.a. river, forcing the mixer to move. >> that's when i started getting scared. and if the water pushed us right into the middle of the river and we started floating down river.