GUPPY: The U.S. Navy Submarine Program That History Almost Forgot

Summary and Key Points: The Greater Underwater Propulsion Power Program (GUPPY) was launched by the U.S. Navy after World War II to enhance submarine speed, maneuverability, and endurance.

-Sparked by the effectiveness of German U-boats, GUPPY aimed to modernize American submarines, starting with reverse engineering German Type XXI U-boats.

-The program, which ran from 1947 to 1963, included multiple iterations, such as GUPPY I and II, focusing on streamlining structures, increasing battery capacity, and adding snorkels.