A stunning revelation puts Josh and Izzy's lives on the line; Eve and the other survivors search for a boy who holds the key to saving them.
With cold weather approaching, Eve, Levi and Ty return to the fort, hoping to learn 10,000 B.C. survival skills.
Eve navigates the dangerous wilderness in order to save Josh; Gavin and Izzy work to prove survivors are alive inside the sinkhole.
On the season finale, there’s news of one last sinkhole opening and a race to Seattle to launch a final rescue effort before it's too late.
With time running out before their window home closes, the survivors hatch a final escape attempt, forcing Eve to make an impossible choice.
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