Timothy de Smet and his team of archaeologists from Binghamton University are using hi-tech equipment on a fascinating project. Using non-destructive methods, they’re exploring the ground beneath the former exercise yard at the notorious Alcatraz Federal Penitentiary. And what their investigations ultimately reveal comes as a complete surprise…

We’ll return to de Smet and the finds that he made, but first let’s find out more about Alcatraz. The island itself is located in the waters of the bay of San Francisco and sits just over a mile from the Californian city. It’s basically a rocky outcrop measuring just over 1,700 feet long and 580 feet at its widest point.

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