#7 The Alcatraz Escape
From 1934 to 1963, the Alcatraz Federal Prison had a notorious reputation of being inescapable.
This prison is located in San Francisco Bay and was never broken out of. However, three bank robbers, John Anglin, Frank Morris, and Clarence Anglin, managed to break free.
They dug their way out of the prison using spoons and escaped in a raft made using raincoats. They were never found, so no one knows whether they drowned or made it out alive.
A letter, supposedly from Anglin, was found years later, but its authenticity is questionable.