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What on Earth?
Season 12 · Episode 9
Secrets of Biosphere 2
0.042mMarch 9, 2023
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.
Episodes
- Episode 1Bullseye in the Sky
- Episode 2Mystery of the Fallen Star
- Episode 3Indiana's War Factory
- Episode 4Turkey's Lost Terror Dome
- Episode 5Blood Feud of Gresham Castle
- Episode 6The Boneyard of Arizona
- Episode 7Nevada's Mystery Marking
- Episode 8Ghost Ship of Ireland
- Episode 9Secrets of Biosphere 2
- Episode 10Arctic Hunters of Norway