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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.
If they had timed their escape just right, three prisoners who slipped out of Alcatraz more than 50 years ago on a raft made from raincoats would have had a chance of survival, new research shows.