Alcatraz was known for its escape attempts due to its reputation as one of the most secure and inescapable prisons in history. Over the 29 years that the Federal prison operated, 36 men were involved in 14 separate escape attempts. Of these, 23 were caught, 6 were shot and killed during their escape, and 2 drowned. Two of the men who were caught were later executed in the gas chamber at the California State Prison at San Quentin for their role in the death of a correctional officer during the famous "Battle of Alcatraz" escape attempt. Officially, no one ever succeeded in escaping from Alcatraz, although to this day there are five prisoners listed as "missing and presumed drowned." If a person is well-trained and -conditioned, it is possible to survive the cold waters and fast currents. However, for prisoners - who had no control over their diet, no weightlifting or physical training, and no knowledge of high and low tides - the odds for success were slim.