"Sutton" and were relieved of patrol duty on 9 May to intercept the which wished to surrender. They contacted the former sea wolf the next day, and the two ships began escorting it to Casco Bay. However, "Sutton" was soon detached to accept the surrender of . "Sutton" met the latter U-boat two days later, and she escorted it towards the United States. On 15 May, she put a 15-man boarding party on the submarine and embarked 37 prisoners. "Sutton's" destination was changed to Portsmouth, New Hampshire, where she arrived with "U-234" on the 19th. The submarine and the prisoners were delivered to a representative of the 1st Naval District. "U-234" had left Germany with a cargo bound for Japan of a disassembled Messerschmitt Me 262 jet plane, two Japanese scientists, and two high ranking German officers, including "General der Flieger" Ulrich Kessler of the Luftwaffe. While this was enough to create a media sensation, it was decades later before the U.S. government revealed that the submarine also carried a load of uranium oxide produced by the German atomic weapons program bound for a last-ditch Japanese effort. Instead, the extremely valuable nuclear material was diverted to the Manhattan Project, and ended up part of the bomb the U.S. Army Air Corps dropped over Hiroshima. "Sutton" steamed on to New York two days later and remained there until early June.