Secrets of Biosphere 2

Mar 9, 202342 min

Satellite images capture a mysterious group of pyramid-shaped structures in the arid, desert landscape of Arizona; experts investigate a highly controversial research facility designed to prepare humanity for life on another world.

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Seasons12

All 1 2 3 4 5 6 7 8 9 10 11 12

Season 12 Episodes10

Bullseye in the Sky

Mystery of the Fallen Star

Indiana's War Factory

Turkey's Lost Terror Dome

Blood Feud of Gresham Castle

The Boneyard of Arizona

Nevada's Mystery Marking

Ghost Ship of Ireland

E9Now viewing

Secrets of Biosphere 2

E10

Arctic Hunters of Norway

Cast2

Steven Kearney

Narrator

Andrew Gough

Self

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Episode Summary

"Secrets of Biosphere 2" is episode 9 of What on Earth? season 12. It aired on March 9, 2023.

Next: E10 · Arctic Hunters of Norway Best of Season 12