San Francisco Through the Periscope of a Submarine

Battle stations! U.S.S. Catfish submarine, on maneuver from its post-World War II base in San Diego in 1951, has spotted Alcatraz off the coast of San Francisco and captured the prison island on photo through its periscope.
Peter Hartlaub of The Big Event blog over at SF Gate has more photos of San Francisco, as taken by the submarine, probably right before it commenced a Crazy Ivan maneuver: More