E3 • Episode 3

E1 • Episode 1

Satellite images could explain desert ruins rumoured to be an entrance to an underworld and a city-sized chunk of ice suddenly disappears in Antarctica.

41m • 2017

Satellite images could explain desert ruins rumoured to be an entrance to an underworld and a city-sized chunk of ice suddenly disappears in Antarctica.

E2 • Episode 2

A giant carving of a strange creature suddenly appears in the Australian Outback and mysterious bright green lights illuminate the seas around Thailand.

41m • 2017

A giant carving of a strange creature suddenly appears in the Australian Outback and mysterious bright green lights illuminate the seas around Thailand.

E3 • Episode 3

Strange black holes appear near Egypt's ancient pyramids and a mysterious red swarm invades a beach in India.

41m • 2017

Strange black holes appear near Egypt's ancient pyramids and a mysterious red swarm invades a beach in India.

E4 • Episode 4

A bright pink lake could point to a strange, undiscovered new species. When a young boy disappears in a sand dune, satellite images help with the investigation.

41m • 2017

A bright pink lake could point to a strange, undiscovered new species. When a young boy disappears in a sand dune, satellite images help with the investigation.

E5 • Episode 5

Investigators find a new clue about the missing Malaysia Airlines flight that disappeared in 2014, and an astronaut spots something strange in the Sahara Desert.

41m • 2017

Investigators find a new clue about the missing Malaysia Airlines flight that disappeared in 2014, and an astronaut spots something strange in the Sahara Desert.

E6 • Episode 6

An ominous shadow engulfs the Pacific Ocean and scientists have trouble explaining a strange lake that's shaped like a perfect circle.

41m • 2017

An ominous shadow engulfs the Pacific Ocean and scientists have trouble explaining a strange lake that's shaped like a perfect circle.

E7 • Episode 7

A dagger sealed in King Tut's tomb for over 3,000 years is made of a possibly extraterrestrial metal. A huge swastika is found in the desert near Roswell.

41m • 2017

A dagger sealed in King Tut's tomb for over 3,000 years is made of a possibly extraterrestrial metal. A huge swastika is found in the desert near Roswell.

E8 • Episode 8

A heavily armoured force takes over one of Syria's most ancient archaeological sites, prompting fears that its relics are being stolen.

41m • 2017

A heavily armoured force takes over one of Syria's most ancient archaeological sites, prompting fears that its relics are being stolen.

E9 • Episode 9

A giant swastika appears in a forest in Germany. A strange pattern is etched into the desert near the famous Nazca lines, but archaeologists don't know who put it there.

41m • 2017

A giant swastika appears in a forest in Germany. A strange pattern is etched into the desert near the famous Nazca lines, but archaeologists don't know who put it there.

E10 • Episode 10

Satellite images reveal how El Chapo escaped from a high-security prison in Mexico and a giant black stain appears in a war-torn area of Iraq.

41m • 2017

Satellite images reveal how El Chapo escaped from a high-security prison in Mexico and a giant black stain appears in a war-torn area of Iraq.

E11 • Episode 11

A giant letter Z is carved into a Mexican hillside, evoking the mark of a legendary outlaw. A strange sighting in Germany points to secrets from the Cold War.

41m • 2017

A giant letter Z is carved into a Mexican hillside, evoking the mark of a legendary outlaw. A strange sighting in Germany points to secrets from the Cold War.

E12 • Episode 12

An area of the US-Mexico border becomes an international mystery and ancient rock carvings in a remote mountain range depict unearthly beings.

41m • 2017

An area of the US-Mexico border becomes an international mystery and ancient rock carvings in a remote mountain range depict unearthly beings.

E13 • Episode 13

An amateur archaeologist finds strange symbols scratched into the Kazakhstan desert and a lake in the Brazilian rain forest turns bright pink.

41m • 2017

An amateur archaeologist finds strange symbols scratched into the Kazakhstan desert and a lake in the Brazilian rain forest turns bright pink.

E14 • Episode 14

When terrorists kidnap more than 200 schoolgirls in northern Nigeria, rescuers use satellites to track them down.

41m • 2017

When terrorists kidnap more than 200 schoolgirls in northern Nigeria, rescuers use satellites to track them down.

E15 • Episode 15

New evidence could lead to the discovery of an unknown ancient civilization in the Amazon rainforest and an unidentified submarine is spotted in a North Korean shipyard.

41m • 2017

New evidence could lead to the discovery of an unknown ancient civilization in the Amazon rainforest and an unidentified submarine is spotted in a North Korean shipyard.

E16 • Episode 16

A giant chasm opens in Siberia, dubbed a gateway to the underworld. Meanwhile, an entire island mysteriously vanishes without a trace.

41m • 2017

A giant chasm opens in Siberia, dubbed a gateway to the underworld. Meanwhile, an entire island mysteriously vanishes without a trace.

E17 • Episode 17

A bright green swirling spiral appears in the seas of the Persian Gulf and a massive complex suddenly appears in Myanmar.

41m • 2017

A bright green swirling spiral appears in the seas of the Persian Gulf and a massive complex suddenly appears in Myanmar.

E18 • Episode 18

Strange images from a remote and empty desert could explain the mysterious mummies found there and an apocalyptic sandstorm swallows the Middle East.

41m • 2017

Strange images from a remote and empty desert could explain the mysterious mummies found there and an apocalyptic sandstorm swallows the Middle East.

E19 • Episode 19

A young boy makes international headlines when he uses satellite images to discover lost cities of the Maya and trees in China seem to be spelling out a sinister message.

41m • 2017

A young boy makes international headlines when he uses satellite images to discover lost cities of the Maya and trees in China seem to be spelling out a sinister message.

E20 • Episode 20

The myth of Merlin is associated with an arrangement of stones in northern France. Satellite images might finally explain this ancient riddle.

41m • 2017

The myth of Merlin is associated with an arrangement of stones in northern France. Satellite images might finally explain this ancient riddle.