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 fortress-like 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 didn't? National Geographic goes inside the U...