S7 episodes 1-20 streaming until 4 Jan 2026
What On Earth?
Watch all available episodes of What On Earth?
Strange spots near the Grand Canyon may hold clues to the legendary treasure of a notorious bandit. Satellite images could explain desert ruins rumoured to be an entrance to an underworld. A city-size chunk of ice suddenly disappears in Antarctica.
Episode 2A giant carving of a strange creature suddenly appears in the Australian Outback. Mysterious bright green lights illuminate the seas around Thailand. Top secret activity is discovered at Iran's nuclear facility.
Episode 3Strange black holes appear near Egypt's ancient pyramids and a mysterious red swarm invades a beach in India.
Episode 4Legends of ancient giants surround a mysterious monument in the Middle East. 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.
Episode 5Investigators find a new clue about the missing Malaysia Airlines flight that disappeared in 2014. An astronaut spots something strange in the Sahara Desert, and a mysterious orange sludge invades a remote village in Alaska.
Episode 6A buried monument offers new evidence about one of the Bible's greatest mysteries. An ominous shadow engulfs the Pacific Ocean and scientists have trouble explaining a strange lake that's shaped like a perfect circle.
Episode 7A 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.
Episode 8A heavily armoured force takes over one of Syria's most ancient archaeological sites, prompting fears that its relics are being stolen. Tanks appear to be facing off in Antarctica next to an unworldly object. A water reservoir in LA suddenly turns black.
Episode 9A 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, and mysterious markings are spotted in an isolated corner of Antarctica.
Episode 10Satellite images reveal how El Chapo escaped from a high-security prison in Mexico. Mysterious patterns in the Australian outback and the Kalahari Desert spark a major scientific investigation and a giant black stain appears in a war-torn area of Iraq.
Episode 11A 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. Massive, blood-red marks in China prompt fears of a violent government crackdown.
Episode 12A strange mass breaches surface of an ocean near Antarctica, sparking rumours of a mythological sea monster. An area of the US-Mexico border becomes an international mystery. Ancient rock carvings in a remote mountain range depict unearthly beings.
Episode 13An amateur archaeologist finds strange symbols scratched into the Kazakhstan desert. CIA surveillance photographs show what appears to be a giant Star of David on the island of Cuba, and a lake in the Brazilian rain forest turns bright pink.
Episode 14A vast structure buried in the sands near the legendary city of Petra points to a bloody past. When terrorists kidnap more than 200 schoolgirls in northern Nigeria, rescuers use satellites to track them down.
Episode 15New evidence could lead to the discovery of an unknown ancient civilization in the Amazon rainforest. A strange photo reveals a massive Arctic canyon buried beneath the ice and an unidentified submarine is spotted in a North Korean shipyard.
Episode 16A huge chasm appears in a remote part of the Siberian forest. Locals call it to a gate to the underworld. Plus, an island disappears off the face of the planet.
Episode 17Strange images from the jungles of Colombia could lead researchers to the legendary city of El Dorado. A bright green swirling spiral appears in the seas of the Persian Gulf and a massive complex suddenly appears in Myanmar.
Episode 18New evidence could reveal the remains of an ancient Roman city thought to be lost forever. Strange images from a remote and empty desert could explain the mysterious mummies found there and an apocalyptic sandstorm swallows the Middle East.
Episode 19A young boy makes international headlines when he uses satellite images to discover lost cities of the Maya. satellite images might point to a modern-day genocide and trees in China seem to be spelling out a sinister message.
Episode 20The myth of Merlin is associated with an arrangement of stones in northern France. Satellite images might finally explain this ancient riddle. Investigators uncover something mysterious buried beneath the Gulf of Mexico.
Show more- About this series
- Science Channel's most watched series reveals Earth as it's never been seen before. Illuminating views captured by more than 4,000 orbiting satellites, `What on Earth?' investigates mysteries from strange geological occurrences to weird man-made structures. Every day, the eyes in the sky uncover new mysterious phenomena, and some defy easy explanation. To search for answers, the series combines modern imaging technology with analysis from military and intelligence professionals as well as leading scientists.
- CrewSusanna Herbert (Director), Bella Falk (Director)
- GenreFeatures, Factual
- Seasons7
- ChannelSky History
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- There are 7 seasons of What On Earth? available to stream on NOW.