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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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53:19
Investigate one of the most powerful volcanic eruptions in recorded history.
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53:31
Follow scientists determined to save the critically endangered right whale.
53:31
Here’s how the U.S. could reach net-zero carbon emissions by 2050.
53:31
Americans use ancient wisdom and new technology to fight extreme weather.
53:31
See the latest stunning images and discoveries from the James Webb Space Telescope.
53:21
Archaeological discoveries reveal traces of ancient civilizations in the Amazon.
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53:20
Thousands race to build Europe's biggest construction project–London's new railroad.
53:31
Who created the Nazca lines and why? New clues to one of the greatest ancient enigmas.
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53:43
A team tackles the restoration of iconic Notre Dame Cathedral.
53:43
Ancient footprints provide new evidence of humans and extinct giant beasts of the Ice Age.
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53:20
How could a single ship cause a major supply chain crisis around the globe?
53:16
Sir David Attenborough explores a site with traces of ancient mammoths and Neanderthals.