study of Japanese records did not confirm either sinking. After 61 days at sea, including 37 days in her patrol area, Sea Cat arrived at Guam for refit. The submarine got underway again on 1 February 1945 for her second war patrol which she conducted in the East China Sea in a wolf pack which included and . During operations off the coast of Kyūshū, she damaged a 300-ton cargo ship by gunfire and attacked a 2,000-ton ship with torpedoes. Although she reported sinking the latter, Japanese records do not seem to support the claim. Sea Cat completed the patrol upon arriving at Midway on 24 March. On 27 April, the submarine sailed for the Yellow Sea where she and six other submarines preyed upon Japanese shipping. Sea Cat accounted for 400 tons of enemy vessels by gunfire, and she picked up two survivors of the sunken enemy ships for questioning before returning to Pearl Harbor on 25 June. She headed toward the Kuril Islands on 6 August for her fourth war patrol; but, upon arrival in her patrol area, learned that hostilities had ceased. She was ordered to proceed to the Japanese home islands and was in Tokyo Bay during the formal surrender ceremony on 2 September. Sea Cat earned three battle stars for her World War II service. She then sailed for the Marianas and reached Guam on 7 September. Following a brief stay at Apra Harbor, the submarine headed home. Following operations in the San Diego area into the spring of 1946, the ship proceeded to San Francisco Bay and arrived at Mare Island on 15 April 1946 for overhaul. Post War duties in Atlantic Yard work completed on 26 July, Sea Cat sailed back to San Diego, whence she departed on 12 August for her first simulated war patrol. On this cruise she visited Hawaii; Canton Island; Swains, Samoa, and Atafu Island; Tsingtao, and Shanghai. Then, transferred to the Atlantic Fleet, the submarine arrived at Balboa, Canal Zone, on 12 January 1947. After two and one-half years of exercises out of Balboa, her home port was changed to Key West in June 1949. In the autumn, it was decided to have a number of experimental changes made to the ship during her forthcoming overhaul, and she was redesignated AGSS-399 on 30 September. On 7 November, she arrived at the Philadelphia Naval Shipyard where the work was