Escape from Alcatraz
Alcatraz inmates and bank robbers Frank Lee Morris, Clarence Anglin, and John Anglin spent a year tunneling out of their cells using sharpened spoons. The flimsy raincoat raft they used to escape from "The Rock" eventually washed up on a nearby shore, but no trace of the prisoners was ever found.
Photograph by Benlechlitner, courtesy Wikimedia. This image has been released into the public domain.