Backdrop image for movie Last of the Great Unknown

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.

  • Documentary

Top billed cast

  • Photo of Bill FormanekBill FormanekSelf
  • Photo of Todd MartinTodd MartinSelf
  • Photo of Dave NallyDave NallySelf
  • Photo of Rich RudowRich RudowSelf
  • Photo of Guy SmithGuy SmithSelf

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