Channel 5 - Drain Alcatraz (2017)

Drains the waters from around Alcatraz island revealing San Francisco Bay to be a fascinating and chaotic place. On the dry bay floor are scars left by earthquakes, giving scientists an idea of when the next one will strike - and what could happen to San Francisco if one does. Not only that - the draining also reveals why the notorious Alcatraz island prison, which sat in the south of the bay, proved so inescapable.

https://www.channel5.com/show/draining-alcatraz

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