What on Earth?

When mysterious structures are discovered deep in a remote forest, experts investigate if this strange site was the long-lost birthplace of a top-secret Nazi project. (S7, ep 1)

When instruments on the International Space Station malfunction, experts investigate if this behaviour is more than a tech glitch, but a prophecy of doomsday. (S7, ep 2)

Circles of reindeer appear in the remote tundra of Sweden. Experts investigate if this strange event could be evidence of fatal aftershocks from the Chernobyl nuclear disaster. (S7, ep 3)

When an island off the coast of Mexico suddenly disappears, government officials scramble to find an explanation. (S7, ep 4)

When the people of a thriving Midwestern town suddenly disappear, they leave behind an eerie ghost town with a dark secret. (S7, ep 5)

When satellites spot anomalies in the unexplored Amazonian jungle, experts wonder if they've discovered relics of a lost civilisation. (S7, ep 6)

Aerial images reveal a strange dark stain covering a coastal town. (S7, ep 7)

Experts uncover a labyrinth that could lead them to the secrets of Imhotep. (S7, ep 8)

Strange satellite images taken above the Nile Valley could point investigators to long-lost relics buried in an unexplored city of the dead. (S7, ep 9)

New satellite evidence reveals a mysterious spiral structure from space and experts speculate that it could be the lost city of Atlantis. (S7, ep 10)