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Alcatraz Island is a small island off the coast of California. The island is famous for the former prison located there, the Alcatraz Federal Penitentiary, which housed, among others, gangster and Cahill Al Capone during its operation.
Currently it one of many Tomas' strongholds. The Tomas' technique using Alcatraz island was to capture Cahill clue hunters and keep them in the ultra-sound prison. It was mortifying to know how close you were to a clue, and yet be trapped behind steel bars.