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Arctic Sinkholes

Season 49 Episode 1 | 53m 30s

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.

Aired: 02/01/22 | Expires: 02/01/32
National Corporate funding for NOVA is provided by Viking Cruises. Major funding for NOVA is provided by the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.
Extras
Appraisal: Ub Iwerks "Steamboat Willie" Drawing, ca. 1928
Appraisal: Chicago Bears Memorabilia, ca. 1923
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