Welcome back to "caught on camera." i'm contessa brewer. on a warm summer day, a rafting trip nearly turns fatal when beginners encounter a river, wild and swollen with snow melt. the rescue that follows is a high wire act and it's caught on not just one, but two cameras. novice rafters get the ride of a lifetime, and wind up cheating death. >> it was shocking to see the peril that these people were in. >> california's kearn river is a scenic, natural wonder and a popular play ground. >> one of the steepest rivers in the united states and it flows really fast. >> but the river has a dark side ...