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In this 2012 photo released by National Geographic Channels and Brian Catalina Entertainment, Brent Sass sits by a camp fire in McCarthy, Alaska. Sass is among eight mushers or outdoor adventurers featured in the latest reality show set in Alaska. "Ultimate Survival Alaska" premieres Sunday on NatGeoTV. (AP Photo/Brian Catalina Entertainment, Kyle Wheeler)

In this 2012 photo released by National Geographic Channels and Brian Catalina Entertainment, Brent Sass sits by a camp fire in McCarthy, Alaska. Sass is among eight mushers or outdoor adventurers featured in the latest reality show set in Alaska. "Ultimate Survival Alaska" premieres Sunday on NatGeoTV. (AP Photo/Brian Catalina Entertainment, Kyle Wheeler)