What on Earth?

Sky History 2 HD

10:00 AM to 11:00 AM

Monday 21 April

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Satellite images capture thousands of straight lines, covering thousands of square miles, etched out of the Bolivian desert over thousands of years. A satellite tag on a great white shark records a brutal attack by a mystery undersea predator. Plus, the 'town-swallowing' lake in the land of Voodoo