Vanished from Alcatraz

New evidence suggests that at least one convict escaped from Alcatraz and survived National Geographic investigates one of the most intricate prison escapes in history three tireless inmates break from the fortresslike Alcatraz Island Federal Penitentiary and brave the frigid waters in a handmade raft For nearly 50 years it was assumed that these men drowned but what if they didnt National Geographic goes inside the US marshals investigation following the complex and tantalizing leads theyve tracked to close this case