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From Wikipedia, the free encyclopedia. In its 29 years of operation, there were 14 acknowledged attempts to escape from Alcatraz prison involving 34 inmates (two, Joseph Cretzer and Sam Shockley, tried twice). Officially, every escape attempt failed, and most participants were either killed or quickly re-captured.
They were never seen again, prompting claims that they were the only successful escapees in Alcatraz history. But pieces of a makeshift life vest and a bundle of letters wrapped in rubber were later found, suggesting that the men may have drowned amid the stiff currents and freezing waters of San Francisco Bay.