Over nearly 30 notorious years, there are 13 documented escape attempts from Alcatraz, but the obstacles are massive and many, from thick impenetrable concrete walls to a mile and a half of swift, frigid tides to the nearest shoreline.

Taking a fresh look at the facts about the world's fiercest maximum security prison, home to legendary names like Al Capone, Machine Gun Kelly and the Birdman, Robert Stroud.