Abu Zubaydah, arrested in Pakistan in March 2002, has been in US custody for seven years, four-and-a-half of them spent incommunicado in solitary confinement in undisclosed locations. He was subjected to the torture technique of "waterboarding" - simulated drowning - and has allegedly been subjected to numerous other interrogation techniques that violate the prohibition of torture and other cruel, inhuman or degrading treatment. These techniques, approved for use at the highest levels of government, include forced nudity, sleep deprivation, confinement in small dark boxes, deprivation of solid food, cold temperatures, stress positions, and physical assaults. Videotapes of some of his interrogations are believed to be amongst those destroyed by the CIA in 2005.