Alcatraz, the notorious island prison surrounded by the waters of San Francisco Bay, is slowly giving up its secrets. Researchers have now discovered extensive tunnels and other remnants of a military fortress hidden beneath the floors of the site.
Alcatraz, the notorious island prison surrounded by the waters of San Francisco Bay, is slowly giving up its secrets. Researchers have now discovered extensive tunnels and other remnants of a military fortress hidden beneath the floors of the site.
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