4 episodes
The Last Unknown - Season 1
First aired Mar 18, 2021Season 1
Browse all 4 episodes in this season, including available images, air dates, runtimes, ratings and episode summaries from TMDB.
Episodes
Episode 1
The Aleutian Islands
Mar 18, 2021
Ian Shive leads a risky expedition into a remote Alaskan wildlife refuge.
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Episode 2
Palmyra Atoll
Mar 18, 2021
Ian explores one of Earth's most well-protected coral reef ecosystems.
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Episode 3
Rose Atoll
Mar 18, 2021
Ian joins a team of scientists to unlock vital new info about coral reefs.
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Episode 4
The Channel Islands
Mar 18, 2021
Ian explores one of America's least-known national parks.