The Prinz Eugen was allocated to the U.S. Navy and was classified IX-300. In January 1946 she steamed, with an American and German crew, to Boston, arriving on the 24th. She was then sent on to Philadelphia where she had the two 8" (20.3 cm) cannons from her "A" turret removed. These guns were then shipped to the Navy's Weapon facility at Dahlgren, Virginia, for testing. They are now on display there.
Proceeding via the Panama Canal to the Pacific for atomic bomb tests, she survived an atomic explosion at Bikini 25 July 1946, and was towed to Kwajalein where she began to list significantly on 21 December. Despite an attempt to beach her, she capsized and sank 22 December 1946 on a coral reef at Enubuj, Kwajalein Atoll. 海外サイトの記述だと翌年ではなく46年12月22日となっている。