The CIA declines to comment, but current and former intelligence officials tell ABC News that 11 top al Qaeda figures were all held at one point on a former Soviet air base in one Eastern European country. Several of them were later moved to a second Eastern European country.

All but one of these 11 high-value al Qaeda prisoners were subjected to the harshest interrogation techniques in the CIA's secret arsenal, the so-called "enhanced interrogation techniques" authorized for use by about 14 CIA officers and first reported by ABC News on Nov. 18.

Sources tell ABC News that the CIA has a related system of secretly returning other prisoners to their home country when they have outlived their usefulness to the United States.

These same sources also tell ABC News that U.S. intelligence also ships some "unlawful combatants" to countries that use interrogation techniques harsher than any authorized for use by U.S. intelligence officers. They say that Jordan, Syria, Morocco and Egypt were among the nations used in order to extract confessions quickly using techniques harsher than those authorized for use by U.S. intelligence officers. These prisoners were not necessarily citizens of those nations.

According to sources directly involved in setting up the CIA secret prison system, it began with the capture of Abu Zabayda in Pakistan. After treatment there for gunshot wounds, he was whisked by the CIA to Thailand where he was housed in a small disused warehouse on an active airbase. There, his cell was kept under 24-hour closed circuit TV surveillance and his life-threatening wounds were tended to by a CIA doctor especially sent from Langley headquarters to assure Abu Zubaydah was given proper care, sources said. Once healthy, he was slapped, grabbed, made to stand long hours in a cold cell and finally handcuffed and strapped feet up to a water board until after .31 seconds he begged for mercy and began to cooperate.

While in the secret facilities in Eastern Europe, Abu Zubaydah and his fellow captives were fed breakfasts that included yogurt and fruit, lunches that included steamed vegetables and beans, and dinners that included meat or chicken and more vegetables and rice, sources say. In exchange for cooperation, prisoners were sometimes given hard candies, deserts and chocolates. Abu Zubaydah was partial to Kit Kats, the same treat Saddam Hussein fancied in his captivity.

Of the 12 high value targets housed by the CIA, only one did not require water boarding before he talked. Ramzi bin al-Shibh broke down in tears after he was walked past the cell of Khalid Sheik Mohammed, the operational planner for Sept. 11. Visibly shaken, he started to cry and became as cooperative as if he had been tied down to a water board, sources said.

Following is a list of 12 high-value targets housed by the CIA.

 Abu Zubaydah: Held first in Thailand then Poland

 Ibn Al-Shaykh al-Libi: Held in Poland. Previously held in Pakistan/Afghanistan

 Abdul Rahim al-Sharqawi: Held in Poland

 Abd al-Rahim al-Nashiri: Held in Poland

 Ramzi Binalshibh: Held in Poland

 Mohammed Omar Abdel-Rahman: Held in Poland

 Khalid Shaikh Mohammed: Held in Poland

 Waleed Mohammed bin Attash: Held in Poland

 Hambali: In U.S. custody. Kept isolated from other high-value targets.

 Hassan Ghul: Held in Poland.

 Ahmed Khalfan Ghailani: Held in Poland

 Abu Faraj al-Libbi: Held in Poland