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http://www.youtube.com/channel/UC9MAhZQQd9egwWCxrwSIsJQAlcatraz: Australia's Deadly Prison | Cities of the Underworld (S3, E13) | Full Episode | History -

Beneath the sunny façade of Sydney, Australia lies a dark past. Built on the backs of convicts, gold miners and outlaws, this nation forged its freedom from the depths of the underground. See more in Season 3, Episode 13, "Alcatraz."

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"Cities of the Underworld" descends below the streets of major cities such as New York, Cairo, London, and Tokyo to explore the remnants of subterranean civilizations left buried there.

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