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视频简介

After decades of conspiracy theories and shrouding secrecy, the CIA finally acknowledged the existence of Area 51. But that was all. The actions on the enigmatic military base continue to be unknown to this day. Now, a motley crew of military service members, government workers, and lowly technicians find themselves thrust into the center of the infamous site's darkest mysterie...。They are home to wolves, elks and tigers: the boreal forests of the north. They store more carbon than all the rainforests put together and, as such, are crucial for the world’s climate. Where permanently frozen ground is mostly covered in metre-high snow, and summer is dominated by drought, conifers and ground-cover plants are accustomed to fire. Some plants even need the flam...。Some of the Season 4 episodes were aired during Season 3 to compensate for episodes in that season being pushed back.。