Dolphin performing diving tests off Provincetown, MA during her initial builder's sea trials circa June, 1932. She is not yet complete, and it is interesting to see the unpainted condition of the submarine and the lack of decking over the raised section aft of the fairwater. Note the spray from the open vent on the top of a ballast tank. #2 periscope is raised, and the U-shaped bracket on the right side of the bridge is for a searchlight that is taken below before diving. Also note the abbreviated aft fairwater deck, later to be lengthened. Even the "D1" are sheet metal letters riveted on and not painted.
US Navy Photo Contributed by Roger Torgeson
Dolphin, almost fully submerged, performing diving tests off Provincetown, MA during sea trials circa June, 1932. This photo taken a few minutes after the one seen above.
