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        Secrets of Underground London: Part 2

        In this segment of Secrets of Underground London, learn about how the Great Fire of London in 1636 transformed chalk and the Chislehurst caves into a hot commodity with a chilling secret. The Great Fire burned eighty percent of the city to ashes and the city's architects found the key to its future buried deep under a suburb called Chislehurst. Nearly 230 feet below the surface and winding for over 22 miles, a labyrinth of chalk was mined for the new construction standard of brick and mortar in the city. Far into the mines is a natural pool with a connection to a grim legend and a now banned contemporary challenge.


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