S1, E2: Along Australia's entire eastern coast is an extraordinary wall of rock known as the Great Divide. Running 2,300 miles, this massive range runs from the icy mountains of Tasmania, through the regal forests of the Central Highlands, past volcanic monuments, all the way north to the most ancient of rainforests. Its diverse landscape is matched by the wide variety of creatures who live here: fierce devils, ancient giants, and silent killers that have evolved remarkable adaptations over millions of years to survive and thrive in these mountains.