USS Squalus (SS-192) Salvage Operations, 1939
Divers closing valves in salvage pontoons after Squalus had been lifted off the sea bottom, 12 August 1939. There were separate groups of pontoons supporting the sunken submarine's bow and stern. Three pontoons were located at the top of the lift line in each location, and came to the surface during the 12 August lift. One of these groups is seen here. After this lift, one more pontoon remained underwater on the bow line and three more on the stern line. Photographed by the Portsmouth Navy Yard, Kittery, Maine. Official U.S. Navy Photograph, from the collections of the Naval History and Heritage Command.