In the wake of the Sept. 11, 2001, terror attacks, the CIA reportedly used a secret facility at the Guantanamo Bay, Cuba, detention center to turn a handful of prisoners into double agents and then sent them home to help kill terrorists.

The program, which was carried out in a complex known as Penny Lane just a few hundred yards from the administrative offices at the prison, aided in the killing of “many” top al-Qaeda operatives, current and former U.S. officials told the Associated Press.

The eight small cottages, seen in the satellite image above, were hidden behind a ridge covered in thick scrub and cactus. Unlike the prison next door, inside the motel-style complex detainees were treated to comfortable beds, private kitchens, a small patio — and even pornography, for those who requested it.