On 11 June 1962, three prisoners escaped from the heavily guarded prison island of Alcatraz, to the north of San Francisco. The fate of Clarence Anglin, John Anglin and Frank Morris remains a big riddle: did they survive their journey with their rubber boat (which they had pieced together themselves) and, if so, where did they land? Dr Olivier Hoes, ir. Rolf Hut (CEG) and Fedor Baart, a hydrological engineer from Deltares, think that they may have found the answer. They investigated the mystery using a flow model for the San Francisco Bay. Their simulation work indicates that an escape would indeed have been possible and that the best time to depart from Alcatraz in a boat that night would have been around 23:30. According to this scenario, the convicts would have landed just north of the Golden Gate Bridge.