with , Muskallunge got underway 1 August for the South China Sea on her fourth war patrol. On 21 August off French Indochina she sank 7,163-ton passenger-cargo Durban Maru before being severely depth charged. The submarine docked in Fremantle 22 September for refit. Her fifth war patrol, 19 October to 14 December, saw her operating west of Palawan Passage. She then left Pearl Harbor 16 December for overhaul at Mare Island Navy Yard, returning 9 April 1945. Sixth and seventh war patrols, April – August 1945 On 26 April Muskallunge departed Pearl Harbor for patrol off Formosa. She also acted as lifeguard for Philippine-based airstrikes on China and Formosa on her sixth war patrol. She sailed to Midway Atoll via Saipan to complete the patrol on arrival 15 June. Her seventh and last war patrol started 30 July when Muskallunge got underway for the Kurile Islands, north of Japan. On 8 August she attacked several small ships through dense fog. Her guns damaged two of the Japanese ships, but enemy fire killed one of the submarine's gunners and wounded two other bluejackets. The news of victory brought orders to Tokyo Bay for the surrender ceremonies on board the battleship 2 September. The next day Muskallunge sailed for New London via Pearl Harbor and the Panama Canal. After operations with the Atlantic Fleet, she decommissioned and joined the Atlantic Reserve Fleet there 29 January 1947. Muskallunge received five battle stars for World War II service. Humaitá (S14), 1957–1968 Muskallunge recommissioned 31 August 1956 prior to transfer to Brazil; decommissioned 18 January 1957, and the same day was loaned under the Military Assistance Program. She served the Brazilian Navy as Humaitá (S14) until returned to the United States in March 1968 and sunk as a target off Long Island, NY on 9 July 1968. Discovery On 26 June 2021 NOAAS Okeanos Explorer explored the wreckage of Muskallunge with the ROV Deep Discoverer. The hull was found to have been severed near the forward engine room with the bow and stern falling to the sea floor separately. See also List of submarines of the Second World War References Bibliography External links navsource.org: USS Muskallunge Kill Record: USS Muskallunge Gato-class submarines Ships built in Groton, Connecticut 1942 ships World War II submarines of the United States Gato-class submarines of the Brazilian Navy Ships sunk as targets Maritime incidents in 1968