Horizon - Season 37 (2000)

1947, a British civilian version of the wartime Lancaster bomber took off from Buenos Aires airport on a scheduled flight to Santiago, but never made it. Instead it vanished when it was apparently just a few minutes from touchdown.

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Horizon examines supermassive black holes and the recent discovery that they are crucial to the formation of galaxies. Supermassive black holes were originally hypothesized to explain active galaxies and quasars, but later were discovered to be at the center of many ordinary galaxies including our own.

A boy whose penis was burnt off when a circumcision goes wrong is turned into a girl as an attempt to prove a theory about gender identity.

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No one quite knows what happened in the tropical aquarium of a German zoo two decades ago, but according to biologists, experiments with a tropical seaweed unleashed a hybrid algae which is now decimating marine life in the Mediterranean. It was in the late 1980s that Alexandre Meinesz, a professor of biology at France's University of Nice-Sophia Antipolis on the Mediterranean coast, first detected the spread of a new species of algae along the French coastline. Horizon follows Meinesz on a scientific detective story as he attempts to unravel the source of this alien ...

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A controversial theory posits that for millions of years Earth was entirely ice covered.

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Many theories about Russia's unsinkable Kursk submarine sinking in August 2000 are explored and analyzed.