Salvage of USS F-4 (SS-23), April-August 1915
F-4 in drydock at Honolulu, Hawaii, on 1 September 1915, after she had been raised from over 300 feet of water and towed into port. Note the large implosion hole in her port side, and the salvage pontoons used to support her during the final lift. This view shows F-4's port bow. She is upside down, rolled to starboard approximately 120 degrees from the vertical. Photographed by Kodagraph, Honolulu. Courtesy of Donald M. McPherson, 1972. U.S. Naval History and Heritage Command Photograph.