Last of the Great Unknown (2012)
The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
Director: Dan Ransom
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Bill Formanek as Self |
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Todd Martin as Self |
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Dave Nally as Self |
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Rich Rudow as Self |
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Guy Smith as Self |
| Directing | Dan Ransom | Director |