Did they succeed in escaping from alcatraz?

In 1962 Frank Morris, John and Clarence Anglin escaped from The Rock, the prison known as Alcatraz, some claim they could have made it, relatives claim they recieved south American postcards from the Anglins and even the mythbusters team proved it...

could be done, do you think they suceeded and if they did could they still be alive today??

I think it's plausible- However, if they're still alive, I don't think they're going to admit to it any time soon.

Frank Morris aka the Birdman was presumed the only one thought to have maid the swim, yet he has not been heard of since. They meaning authority's believe he drowned like the other two and was carried out to sea with the current but no one really knows I'd like to think he made it.

Morris and the birdman were 2 different prisoners