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In this 2012 photo released by National Geographic Channels and Brian Catalina Entertainment, Dallas Seavey, Willi Prittie, Tyrell Seavey, Brent Sass, Austin Manelick, Marty Raney, Tyler Johnson and Matt Raney, from left, pose for a photo in Alaska. The eight mushers or outdoor adventurers will be featured in the latest reality show set in Alaska. "Ultimate Survival Alaska" premieres Sunday on NatGeoTV. (AP Photo/National Geographic Channels, Stewart Volland)

In this 2012 photo released by National Geographic Channels and Brian Catalina Entertainment, Dallas Seavey, Willi Prittie, Tyrell Seavey, Brent Sass, Austin Manelick, Marty Raney, Tyler Johnson and Matt Raney, from left, pose for a photo in Alaska. The eight mushers or outdoor adventurers will be featured in the latest reality show set in Alaska. "Ultimate Survival Alaska" premieres Sunday on NatGeoTV. (AP Photo/National Geographic Channels, Stewart Volland)