Dramatic real-life footage is captured by the rescuers themselves. A kayaker in New Zealand fights to save his drowning friend.

Dramatic real-life footage captured by the rescuers themselves. A caver tries to save his friend trapped in a flooding passage.

A freak accident severs a professional cyclist's artery miles from medical help, a kayaker fights to rescue his friend who's trapped upside down in white water rapids, and a backcountry skier is buried alive in a tree well.