The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
Bill Formanek
Todd Martin
Dave Nally
Rich Rudow
Guy Smith
Score: 7.3
Score: 7.4
Score: 7.4
Score: 5.2
Score: 4.5
Score: 6.3
Score: 6.6
Score: 7.0
