Summary: Did Anybody Ever Escape Alcatraz?

Introduction
In this personal project I am going to described information about "Did anybody ever escape Alcatraz?"
Here, I included three subtopics to answer the question:
- Military Prison
- Alcatraz Most Notorious Criminals
- Average prisoners stay in Alcatraz

Alcatraz was a jail were the most dangerous prisoners lived, located in San Francisco, composed of little buildings inside the place, and with capacity of 450 prisoners. This place is known for the famous security system they used.
At the beginning, at the moment to start this essay I already had acknowledge about this topic, I know the location, details about the place, and how important is for the United States. But for getting complete my project I needed to investigate more depth
Machine Gun Kelly: An American bootlegger, bank robber and kidnapper who made headlines in the 1930s. He was sentenced to life in prison along with wife Kathryn Kelly in 1933.
Average prisoners stay in Alcatraz
About eight years. Men were never sentenced directly to Alcatraz, but they had to earn their way to the island through bad behavior at another federal institution.
Alcatraz was sometimes called "the prison within the prison system." Good behavior could earn a convict a transfer to another federal institution, but almost never a direct release from prison. Only two men were released directly from Alcatraz to their freedom.
Prisoners were allowed to one visit each month and the visit had to be approved directly by the Warden. Prisoners were not allowed to discuss actual events or anything of their life in prison. No physical contact was allowed. They talked with visitors via intercom and a correctional officer was supposed to monitor the
In my project in the "Alcatraz Most Notorious Criminals" subtopic, I wrote about prisoners that were documented as lost, and it is possible that this happened by the way it is described.
Maybe there is no complete information, but some escapes of criminals are documented as drowned in San Francisco Bay, because maybe in that way was easier to not getting in troubles and difficult for the polices to see in the sea. Also prisoners trying to escape but later recaptured by the national authorities.
According to "Military Prison" subtopic I mentioned the buildings that composed Alcatraz in that places maybe were places to escape, is a little place with many buildings inside a big island.
In my personal opinion I think that it is possible that someone has escaped from Alcatraz, because I understand that this place had a lot of security, but in every jail there have been attempts of escape, so why not in