Season Finale: Lauro nears the end of the Iditarod, crossing260 miles of ice along the Bering Sea coast to reach the finishline in Nome; Marty and his friend Dave haul supplies for acabin into the backcountry, risking disaster on an unstablefrozen river; Tom and Will build an elk hide tipi; Jake andhis dogs chase a black bear into a remote mountain cave; andPaul and Chance construct a bear-proof log cabin chicken coop.