Last of the Great Unknown
Last of the Great Unknown2012
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Last of the Great Unknown
22m·Documentary
Directed by Dan Ransom·2012
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8.0/10 avgAverage user ratingThe story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
DirectorDan Ransom
| Actor | Role |
|---|---|
| BBill FormanekSelf | Self |
 Todd MartinSelf | Self |
| DDave NallySelf | Self |
| RRich RudowSelf | Self |
| GGuy SmithSelf | Self |