50 years after escaping the infamous Alcatraz prison, a man sends a letter to the FBI asking to go back.

While Alcatraz Island is now a national park, it was once home to a federal prison that held some of the most dangerous criminals in American history.

The prison claimed that no one ever successfully escaped the facility: 36 prisoners had tried. Some were caught, some were shot, and a few were never found but presumed to have drowned.

In 1962, Three Men Carried Out One of the Most Daring Prison Escapes in History

Frank Morris, along with brothers John and Clarence Anglin, escaped from Alcatraz prison.

The three served time for a few crimes, including bank robbery and car theft, when they chose to break out.

On June 11, 1962, the trio cut holes in their cell walls and fled outside the building through the ventilation staff.

Before escaping, they also placed paper-mâché dummies in their beds to fool the guards.

They then scaled the fence and fashioned a raft from raincoats and contact cement.

It was around 10 pm when they dived into the cold waters of the San Francisco Bay.

The FBI Never Saw The Three Again

The FBI conducted a thorough investigation into the incident and eventually concluded the trio had drowned in San Francisco Bay.

However, there was no conclusive evidence to support this.

Well, 50 years later, the FBI received this peculiar letter claiming to be from John Anglin.

The Letter Said He, His Brother and His Mate Did Indeed Survive Their Break Out

It reads:

"My name is John Anglin. I escape from Alcatraz in June 1962 with my brother Clarence and Frank Morris."

I'm 83 years old and in bad shape. I have cancer.

Yes, we all made it that night but barely! 'Frank passed away in October 2005. His grave is in Alexandria under another name. My brother died in 2011.

If you announce on TV 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.

This is no joke. This is the real and honest truth."

Is the Letter Genuine?

San Francisco police did not make the letter public despite obtaining it five years earlier.

And while investigating, Marshals and the FBI found a handwriting analysis inconclusive.

If the letter was actually from Anglin, it looks like he lived in Seattle, North Dakota, and Southern California without authorities discovering.