arrived at Guam on 30 June 1945, and after completing voyage repairs, got back underway for her patrol area on 3 July 1945. She arrived in her patrol zone on 7 July 1945. Blackfish executed her lifeguard duties, exploded naval mines, and conducted occasional reconnaissance, but for the most part July 1945 faded away with little to report. On 3 August 1945, a major storm front moved in and broke with full fury, prompting Blackfish to dive to , Sellars noting that he doubted "if we could ride this one out on the surface." Later that night, the storm′s winds and waves dissipated just as quickly as they had arrived. A few days after the storm, what Sellars described as "swarms of American planes" headed toward Kogoshima Kaiwan, and Blackfish was called upon to rescue several downed aviators. Blackfish headed toward the aviators' position at flank speed. At 16:04 on 5 August 1945, she located and recovered six United States Army Air Forces aviators from the sea, all whom were in good spirits and good health. Word reached Blackfish on 6 August 1945 of another downed aviator in a life raft near southeastern Yaku Shima. She searched the area on 7 August, but located only an empty boat. On 8 August, she received a report of a downed plane south of Tsurikaki Light, but she initially received the wrong coordinates, which resulted in a fruitless search, and Sellars remarked that Blackfish′s crew very well could have "saved the pilot if they had been given a correct position." On 8 August, Blackfish bombarded Japanese shore installations on Kasagaki-Shima. On 9 August, she rendezvoused with the submarine and commenced a personnel transfer, taking aboard 17 U.S. Navy and U.S. Army Air Forces personnel who remained aboard Blackfish for the duration of her patrol. Shortly after Blackfish took aboard the additional personnel, her evaporators failed, resulting in a prohibition of bathing. Several more cramped days at sea passed, but at last Blackfish arrived at Guam on 14 August 1945 and moored to the starboard side of the submarine tender , ending the patrol. On 15 August 1945, hostilities with Japan ceased, bringing World War II to an end. In total Blackfish′s twelfth and final war patrol had lasted 60 days, with 33 of them spent on station, 15 devoted to lifeguard duties, and 18 spent conducting offensive patrols. Although she made no attacks