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Earth's natural wonders are among the most extreme places to live on the planet. From soaring mountains to deep jungles, and frozen polar worlds, human beings need bravery and ingenuity to survive within them. The Season 2 premiere

In many of the world's most extraordinary natural wonders, wildlife holds the key to survival for the people who live there. But even there, animals can be foes, as well as friends.

In some natural wonders, people must push themselves to the absolute limit in order to survive. For the people who call these extraordinary places home, survival requires great skill, determination, and courage.