Fifty years after three prisoners broke out of Alcatraz through a spoon-dug tunnel and launched a raft made of raincoats into the San Francisco Bay in a bid for freedom, a lone U.S. marshal is still looking for them. Whether inmates Frank Morris, 35, John Anglin, 32, and his brother Clarence Anglin, 31, made it to safety on June 11, 1962, or sank to a watery grave is not known. U.S. Marshal Michael Dyke, the only official investigator still assigned to the case, has an educated guess.