The CIA has tapes of 9/11 plotter Ramzi Binalshibh being interrogated in a secret overseas prison. Discovered under a desk, the recordings could provide an unparalleled look at how foreign governments aided the U.S. in holding and questioning suspected terrorists.

The two videotapes and one audiotape are believed to be the only remaining recordings made within the clandestine prison system.

The tapes depict Binalshibh’s interrogation sessions at a Moroccan-run facility the CIA used near Rabat in 2002, several current and former U.S. officials told The Associated Press. They spoke on the condition of anonymity because the recordings remain a closely guarded secret.

When the CIA destroyed its cache of 92 videos of two other al-Qaida operatives, Abu Zubaydah and Abd al-Nashiri, being waterboarded in 2005, officials believed they had wiped away all of the agency’s interrogation footage. But in 2007, a staffer discovered a box tucked under a desk in the CIA’s Counterterrorism Center and pulled out the Binalshibh tapes.