This Month in Photo of the Day: Adventure and Exploration Photos

Veteran guide John Robens (at far left) leads a soggy team through a moss-covered passage in Claustral Canyon, a few hours' hike from their exit point. Canyoneering is all about the serendipity of discovery, he says. "You walk for miles and suddenly you find yourself in this magical spot."

See more pictures from the October 2011 feature story "Deep Down Under."