What is known about the caper is that three inmates — brothers Clarence and John Anglin, along with Frank Morris — dug their way out of the supposedly escape-proof federal penitentiary, located in San Francisco Bay, on the night of June 11, 1962. Leaving realistic-looking heads sculpted from papier maché, complete with real hair, in their bunks as dummies, the convicts made their way to the shoreline with a makeshift raft assembled mostly from several dozen rubber raincoats. They slipped off the island into dense fog and were never seen or heard from again.