It was the headline that shocked the nation and left authorities and historians baffled, even to this day. In June 1962, three inmates at the supposedly "inescapable" Alcatraz prison island in San Francisco Bay did the impossible, and managed to break out of the most secure facility in America at the time.
The escape was believed by authorities to have failed, as experts claimed it was impossible for the prisoners to have swam across the harbor onto land. They claim the trio must have drowned in their attempt.
However, over the years rumors that the inmates survived and got away have been appearing, and now it seems that the last surviving inmate has offered to turn himself in.
John Anglin was sentenced to 20 years inside the island penitentiary with his brother, Clarence Anglin. There they met with Frank Morris, all three of them bank robbers, and planned their infamous escape.
Now, after 56 years, the FBI have received a letter supposedly written by John Anglin himself, saying he needs their help and he's willing to go back behind bars to get it.
The letter claims to be penned by John, and he reveals what happened to the three of them after that fateful night.
Saying they all made it to shore that night (barely) he tells the Bureau that Morris and his brother both passed away several years ago. John then tells them he is willing to turn himself in, but not for nothing.
"I’m 83 years old and in bad shape. I have cancer," he explains. "If you announce on T.V. that I will be promised to first go to jail for no more than a year and get medical attention, I will write back to let you know exactly where I am."
The FBI said they ran tests on the handwriting and DNA, but the results were inconclusive.
This isn't the first time someone has offered evidence that the escapees had survived their attempt.
Childhood friend of the Anglin brothers Fred Brizzi offered this photograph he said he took in Brazil after running into the pair.
Their own nephew Ken Widner even swam the supposed route they took in order to prove it was possible, and believes they did the same.
"I don't condone what they did in the robbery, that was wrong," he said. "I did the swim and if I could do that, I know they could have."
The Anglin brothers were gifted swimmers growing up, often shocking their peers by swimming in the icy waters of Lake Michigan in winter.
While the FBI are unsure of the letter's authenticity, they admit that they have yet to close the file on the incredible case of the Alcatraz escape.