- 1 Mega-tsunami: Wave of Destruction
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Horizon investigates an extremely rare and destructive phenomenon that strikes every few thousand years: a mega-tsunami.
Air Date: 2000-10-12
- 2 Conjoined Twins
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Separating conjoined twins is one of the most challenging operations a surgeon can face. Horizon examines the dilemmas which confront doctors and parents.
Air Date: 2000-10-19
- 3 The Lost World of Lake Vostok
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Deep beneath the Antarctic ice sheet lies a vast and ancient lake. Scientists believe that its pristine environment could harbour undiscovered life-forms.
Air Date: 2000-10-26
- 4 Vanished: The Plane that Disappeared
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In 1947 a passenger plane, the 'Star Dust', disappeared in the Andes without a trace. Horizon follows forensic scientists piecing together what happened.
Air Date: 2000-11-02
- 5 The Secret Treasures of Zeugma
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French archaeologists in Turkey battle to unearth what they can of Zeugma before a dam on the Euphrates covers the great Roman trading city forever.
Air Date: 2000-11-09
- 6 Valley of Life or Death
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There's a mystery at the heart of the AIDS epidemic in Africa. Controversially, it seems that circumcision makes people four times less likely to contract HIV.
Air Date: 2000-11-16
- 7 Extreme Dinosaurs
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Dinosaurs just got bigger. Huge plant- and meat-eaters have been unearthed in Argentina along with evidence that the mega-carnivores hunted together in packs.
Air Date: 2000-11-23
- 8 Supermassive Black Holes
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There's growing evidence that the ultimate force of cosmological destruction - a supermassive black hole - may in fact breathe life into every galaxy in the Universe.
Air Date: 2000-11-30
- 9 The Boy who was Turned into a Girl
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The extraordinary story of the Canadian boy who was surgically turned into a girl after birth, offering a fascinating insight into what makes us male and female.
Air Date: 2000-12-07
- 10 Atlantis Reborn Again
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Horizon puts Graham Hancock's controversial evidence for a lost civilisation to the test.
Air Date: 2000-12-13
- 11 Life on Mars
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Horizon explores how the search for Martians is hotting up.
Air Date: 2001-01-18
- 12 Destination Mars
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Tantalising new evidence has emerged that life could exist on Mars. But to find out for sure humans will have to journey to this dry, frozen planet.
Air Date: 2001-01-18
- 13 The Mystery of the Miami Circle
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Builders in Miami, Florida unearth a ring of holes. The State then pays $27million to preserve either a Native American village or remnants of a 1950s sewerage system.
Air Date: 2001-01-25
- 14 The Missing Link
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A trail from Greenland to Britain via Latvia offers new evidence into how evolution could have seen aquatic life form legs and walk.
Air Date: 2001-02-01
- 15 Killer Algae
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A tropical seaweed that escaped from an aquarium is endangering sealife in the Mediterranean and has gone on to infect the California coast.
Air Date: 2001-02-08
- 16 Ecstasy and Agony
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Tim Lawrence was an all-action stuntman until hit by Parkinson's Disease. Horizon follows his hopes of a more normal lifestyle using Ecstasy - a class A illegal drug.
Air Date: 2001-02-15
- 17 Snowball Earth
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The controversial theory that for millions of years the Earth was plunged into catastrophe - entirely smothered in ice up to one kilometre thick.
Air Date: 2001-02-22
- 18 Supervolcanoes
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Beneath America's Yellowstone National Park lies a volcano so colossal that, if it erupts, could threaten the human race with extinction
Air Date: 2001-04-01
- 19 Taming the Problem Child
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Two disruptive children are followed through a controversial treatment regime.
Air Date: 2001-03-08
- 20 What Sank the Kursk?
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118 sailors died inside the Russian Navy's supposedly indestructible submarine. Finding the causes takes investigators back to a British sub tragedy in the 1950s.
Air Date: 2001-08-08