SAN FRANCISCO, CA. (CNN) - Monday was a day to recall one of the great mysteries of San Francisco history. Exactly 50 years ago, three men escaped from Alcatraz. And all these years later, it's not known for sure whether they survived. Relatives of the escapees think it's possible.
Don Sanchez has more from "The Rock."
"I always believed that they made it”
she is one of the sisters of the brothers who escaped from Alcatraz on June 11, 1962.
Inmates Clarence and John Anglin and Frank Morris broke out of Alcatraz and floated away to freedom.
"They always found a way out."
it was an elaborate plan more than a year in the making. Visitors can see where they used spoons to enlarge the ventilation holes in their cell walls, and created lifelike dummy heads to make it look like they were in bed.
They climbed to the roof and slipped into the cold bay waters on a makeshift raft of raincoats and life preservers.
The brothers had been convicted of a bank robbery. But after they broke out of a couple of other prisons, they wound up in Alcatraz.
"They moved them there because they figured they would never find a way out."
but of course they did. And did they survive? A single U.S. Marshal still is looking for them.
"I think there is a possibility of that. There are a lot of things that are unanswered. Mostly there's no bodies found."
And if they are alive, what do they look like?
Here are concepts of the men now in their 80's. Clarence Anglin. John Anglin. And Frank Morris.
What they did eventually "broke the rock." it closed 9 months later.
"So did they successfully leave Alcatraz and wind up in Marin County on that raincoat raft? It is an intriguing thought and it is still a mystery 50 years later."
If they are still alive, the marshal says he would congratulate them on their success, and then arrest them.