The Greater Underwater Propulsion Power Program was initiated by the United States Navy after World War II to improve the submerged speed, maneuverability, and endurance of its submarines.
USS Greenfish after GUPPY III modernization. Visible on deck are the three distinctive shark-fin domes of the PUFFS sonar.
Pomodon after GUPPY I.
USS Cubera, after GUPPY II modernization
USS Thornback after GUPPY IIA modernization
Tench-class submarine
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Tench-class submarines were a type of submarines built for the United States Navy between 1944 and 1951. They were an improvement over the preceding Gato and Balao classes, only about 35 to 40 tons la
Greater Underwater Propulsion Power Program
…systems. The navy immediately focused on designing a new class of submarine, but the Bureau of Ships believed the fleet of existing Gato, Balao, and Tench-class submarines could be modified to incorporate the desired improvements. In June 1946, the Chief of Naval Operations approved the GUPPY project. The initial…
USS Toro shown post-war, after removal of her deck guns, c. 1947.
Periscope photo of Japanese merchant ship sinking
Taiwanese Hai Shih ex-Cutlass still in service
Turkish TCG Uluçalireis moored at the Rahmi M. Koç Museum on the Golden Horn in Istanbul