Alcatraz closed on March 21, 1963, due to the high costs of maintaining the prison, particularly the expense of transporting fresh water to the island and waste away from it. In addition, an escape in 1962 was thought to have contributed to the decision. In that incident, three inmates managed to get out of the prison building, though it is unknown if they managed to cross the San Francisco Bay. Although no bodies were found, there were no credible sightings of the men.
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