US closes once-secret Guantanamo prison unit, moves prisoners The Associated Press April 4 In this April 17, 2019, file photo reviewed by U.S. military officials, the control tower is seen through the razor wire inside the Camp VI detention facility in Guantanamo Bay Naval Base, Cuba. (Alex Brandon/AP) WASHINGTON — A once-secret unit within the Guantanamo Bay detention center that had fallen into disrepair has been closed and the prisoners moved to another facility on the American base in Cuba, the U.S. military said Sunday. The prisoners at Camp 7 were transferred to a facility adjacent to where the other detainees on the base are held as part of what U.S. Southern Command said in a statement was an effort to “increase operational efficiency and effectiveness.”