The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
| Tagline | |
| Release Date: | Apr 26, 2012 |
| Genres: | Documentary |
| Production Company: | |
| Production Countries: | United States of America |
| Casts: | Bill Formanek, Todd Martin, Dave Nally, Rich Rudow, Guy Smith |
| Status: | Released |
| Budget: | $0 |
| Revenue: | 0 |
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