Last of the Great Unknown 2012
8/10 by 1 users
The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
- Released: 2012-04-26
- Runtime: 22 minutes
- Genre: Documentary
- Stars: Bill Formanek, Todd Martin, Dave Nally, Rich Rudow, Guy Smith
- Director: Dan Ransom
