Last Frontier(2011): "frozen Planet" The

: Reindeer herders in northern Russia who use traditional methods to navigate the frozen tundra.

: Film crews collaborated with scientists to explore bizarre, crystal-filled ice caves inside this active volcano. "Frozen Planet" The Last Frontier(2011)

: In Alaska, scientists monitor the Northern Lights and launch rockets into them to study how they disrupt power supplies. : Reindeer herders in northern Russia who use