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The Top Ten Mysteries of the Deep: Count down the top ten mysteries of the deep, from sunken continents to supposed proof of the lost city of Atlantis.

Explore whether the Gods of Greece including Zeus, Apollo and Poseidon, were actually extra-terrestrial visitors to Earth.

Discover the fate of mankind's machinery of war in a world with no people, in which Pearl Harbor comes under renewed attacks, and snow causes urban avalanches.

Discover some of history's most ground-breaking vessels, from Britain's HMS Warrior of 1860 to the German battlecruisers of WWII.

A hard-hitting look at the murder of Rachel Nickell, who was sexually assaulted and murdered in front of her two-year-old son on Wimbledon Common in 1992.

The Top Ten Mysteries of the Deep: Count down the top ten mysteries of the deep, from sunken continents to supposed proof of the lost city of Atlantis.

Explore whether the Gods of Greece including Zeus, Apollo and Poseidon, were actually extra-terrestrial visitors to Earth.

Could extraterrestrials have left us clues to the universe's mysteries? Experts investigate cryptic puzzles that might have been left by ancient aliens.

Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again.

Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation.

Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction.

Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind.

Look down over a constant inferno in Turkmenistan, mysterious circles in the Namibian desert and secret electric blue ponds in Utah.

The team examines a declassified US Department of Defense report which analyses an alleged encounter between a fighter pilot and a UFO.

As Soviet forces push back, Goebbels calls for total war amid the devastation of German cities from Allied bombers.

Ever taken medical advice from a cigarette advert? Dive into a world where animal skin could replace your own and where doctors gave coffee enemas.

As the Roman Republic churns with civil war, Julius Caesar, desperate for fame and honour, embarks on a brutal campaign to annex Gaul and build his own reputation.

The Top Ten Mysteries of the Deep: Count down the top ten mysteries of the deep, from sunken continents to supposed proof of the lost city of Atlantis.