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NOVA
Arctic Sinkholes
Season 49
Episode 1
Colossal explosions shake a remote corner of the Siberian tundra, leaving behind massive craters. In Alaska, a huge lake erupts with bubbles of inflammable gas. Scientists are discovering that these mystifying phenomena add up to a ticking time bomb, as long-frozen permafrost melts and releases vast amounts of methane, a potent greenhouse gas.
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Follow ancient humans’ journey into an icy and perilous new land.
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Follow Homo sapiens as they venture out of Africa and spread farther than any other human species.
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Trace the remarkable origin story of Homo sapiens and the crucial moments that shaped our species.