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Secrets of Biosphere 2
What on Earth? - S12 - E9
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.
What on Earth?: Season 12 - 10 Episode s
12x1 - Bullseye in the Sky
January 12, 2023
Satellite capture a bizarre pattern obscuring an eastern Atlantic island.
12x2 - Mystery of the Fallen Star
January 19, 2023
Aerial archaeologists use laser imaging to capture a distinct star-shaped pattern carved into the marsh of a Florida swamp; experts investigate and reveal a lost Civil War fort linked to an extraordinary community with a tragic past.
12x3 - Indiana's War Factory
January 26, 2023
Satellite images capture a large compound of abandoned structures that are overgrown with vegetation in Indiana; experts investigate and uncover a derelict WWII munitions factory that played a crucial role in US military history.
12x4 - Turkey's Lost Terror Dome
February 2, 2023
Aerial drone imaging captures a circular man-made structure that appears to be centuries-old in the remote forests of Aydin, Turkey; experts investigate a lost ancient amphitheater with a history steeped in gladiatorial bloodshed.
12x5 - Blood Feud of Gresham Castle
February 9, 2023
Satellite images capture a mysterious fortification concealed beneath a patch of woodland in the remote stretches of Norfolk, England; experts investigate rival royal families and a lost castle that was destroyed during a medieval blood feud.
12x6 - The Boneyard of Arizona
February 16, 2023
Satellite images capture miles of aircraft precisely arranged in the vast Arizona desert; experts investigate the largest aircraft storage facility on Earth and the rotting remains of a defining moment in Cold War history.
12x7 - Nevada's Mystery Marking
February 23, 2023
Satellite images capture an enormous X shape mysteriously carved with precision in the remote Nevada desert; experts investigate a military emergency landing field linked to one of the most astonishing test programs in aviation history.
12x8 - Ghost Ship of Ireland
March 2, 2023
Satellite images reveal a mysterious vessel that suddenly appears marooned on a remote stretch of Ireland's southern coast; experts investigate and uncover a bizarre journey near the Bermuda Triangle that resulted in a US Coast Guard interception.
12x9 - Secrets of Biosphere 2
March 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.
12x10 - Arctic Hunters of Norway
March 16, 2023
Aerial archaeologists capture a series of mysterious dots buried beneath the remote, frozen landscape of Finnmark, Norway; experts investigate and reveal revolutionary hunting techniques developed by the oldest surviving Norwegian tribe.
What on Earth?: All seasons
S0: Specials
7 Episode s
S1: Season 1
6 Episode s
S2: Season 2
6 Episode s
S3: Season 3
20 Episode s
S4: Season 4
20 Episode s
S5: Season 5
10 Episode s
S6: Season 6
9 Episode s
S7: Season 7
11 Episode s
S8: Season 8
9 Episode s
S9: Season 9
10 Episode s
S10: Season 10
10 Episode s
S11: Season 11
10 Episode s
S12: Season 12
10 Episode s