Escape from Alcatraz (1979)

In 1960, convict Frank Morris enters Alcatraz, a prison believed to be inescapable. He forms friendships with other inmates and plans an escape with two brothers and another inmate. They dig a tunnel in their cells, create decoy heads, and make rafts. On the night of the planned escape, Charley panics and doesn't show up. Frank and the brothers manage to escape to the shore, but their fate remains unknown.