This 1-hour special for The National Geographic Channel is hosted by professional climber and para-glider Will Gadd. Extreme Expeditions features some of the most daring adventurers on the planet from past film entries in the Banff Mountain Film Festival. Each expedition gives an amazing look at the daredevils who have climbed treacherous mountains, paddled intense whitewater rivers, and crawled through the tiniest crevices inside the most magnificent caves.