Changes to American Fleet Submarines

during World War II



Changes were made to submarines during refit between patrols. Major external changes included more "limber" holes cut into the sides of the hull to speed diving. The fairwater above the main deck was cut down to reduce the silhouette. Radar antennas, sonar "ears" and guns were added. High platforms were added so lookouts could climb higher to see further. Internal improvements were also made. At the end of the war probably no two submarines appeared identical except the rising clipper bow and the stern. Radio wires in the sketches above confuse some of the outlines of the Grouper. See photo below.

Photo taken in 1945. Different shades on hull are camouflage paint that proved effective. Note the "limber" holes in the hull, 2 crewmen by gun on fairwater to right, and flags flying.