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It is hard to believe, but three Alcatraz inmates who were assumed to be dead more than 50 years ago survived could be alive today. Their families are claiming them to be alive.
These three prisoners were last spotted on a makeshift raft in June 1962 and were never seen again, officials assumed them to be drowned after this event.
What happened to these prisoners is still a mystery but let's see what their family have to say about this incident.
They have proof the men paddled to shore and survived, which includes signed Christmas cards sent to the brothers' mother and a photograph which they claim is evidence they were alive in the 1970s.
Before leaving their cells, they left paper-mache heads with their own hair attached in their beds to make it appear like they were tucked up in bed. Alcatraz: Search for the Truth airs on the History Channel at 9 pm EST on Monday.
They clambered through the vents, broke onto the roof of the jail and made their makeshift raft out of raincoats, which they then inflated using an accordion-like concertina.
Alcatraz officials and the FBI insisted that the men drowned, with the investigation closed in 1979. They say no one has ever successfully fled from the notorious jail.
The family took their claims to investigator Art Roderick, a retired US marshal who worked on the case for 20 years.
Previously the authorities had claimed bones washed up on the shore of San Francisco in 1963 belonged to one of the escapees, proving their demise. However the Anglin family allowed investigators to dig up the remains of the brothers' elder sibling Alfred for DNA testing, which later proved the washed up bones were not theirs. Nobody knows what actually happened with them but it was surely a well planned escape.