Above is an on-board video group of people white water rafting down the Middle Fork of the Salmon River in Idaho. Early in the video one of the rafts flips. They chase the flipped raft, running a rough section of the river called the Velvet Falls, as they try to recover it.
It is a 20 minute long video, but the action occurs in the first half. Once they retrieve the flipped raft and tie up on the bank, the rest of the video is a largely static shot of their efforts to flip the overturned raft, and is less interesting unless you're a rafter interested in the process.