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Ice

Season 1 Episode 1
53:18
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Fire

Season 1 Episode 2
53:16
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Water

Season 1 Episode 3
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Earth

Season 1 Episode 4
53:48
Episode 5: The Calling

The Calling

Season 4 Episode 5
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When Whales Could Walk

When Whales Could Walk

Season 51 Episode 1
53:31
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Dynamic Planet

Elephant Seal Tagging

Elephant seals act as living submarines, diving as deep as 5,500 feet and staying under the ice for up to 90 minutes. Seals are tagged to create a record of the increasing seawater temperature. The sedated seal is fitted with miniature oceanographic sensors. They’ll record the location, depth and water temperature whenever the seal dives