Intelligence officers working at the prison were housed next door in the converted stable, raising the roof to add space. Electrical power for both structures was provided by a 2003 Caterpillar autonomous generator. All the electrical outlets in the renovated structure were 110 volts, meaning they were designed for American appliances. European outlets and appliances typically use 220 volts.
The prison pods inside the barn were not visible to locals. They describe seeing large amounts of earth being excavated during the summer of 2004. Locals who saw the activity at the prison and approached to ask for work were turned away by English-speaking guards. The guards were replaced by new guards every 90 days.
Former CIA officials directly involved or briefed on the highly classified secret prison program tell ABC News that as many as eight suspects were held for more than a year in the Vilnius prison. Flight logs viewed by ABC News confirm that CIA planes made repeated flights into Lithuania during that period. In November 2005, after public disclosures about the program, the prison was closed, as was another "black site" in Romania.
The CIA moved the so-called High Value Detainees (HVD) out of Europe to "war zone" facilities, according to one of the former CIA officials, meaning they were moved to the Middle East. Within nine months, President Bush announced the existence of the program and ordered the transfer of 14 of the detainees, including Khalid Sheikh Muhammad, Ramzi bin al Shihb and Abu Zubaydah, to Guantanamo.
In August 2009, after ABC News reported the existence of the secret prison outside Vilnius, Lithuanian president Grybauskaite called for an investigation. "If this is true," Grybauskaite said, "Lithuania has to clean up, accept responsibility, apologize, and promise it will never happen again."
At the time, a Lithuanian government official denied that his country had hosted a secret CIA facility. The CIA told ABC News that reporting the existence of the Lithuanian prison was "irresponsible" and declined to discuss the location of the prison.
On Tuesday, the CIA again declined to talk about the prison. "The CIA's terrorist interrogation program is over," said CIA spokesman Paul Gimigliano. "This agency does not discuss publicly where detention facilities may or may not have been."
Former CIA officials told ABC News that the prison in Lithuania was one of eight facilities the CIA set-up after 9/11 to detain and interrogate top al-Qaeda operatives captured around the world. Thailand, Romania, Poland, Morocco, and Afghanistan have also been identified as countries that housed secret prisons for the CIA. President Barack Obama ordered all the sites closed shortly after taking office in January.
The Lithuanian prison was the last "black" site opened in Europe, after the CIA's secret prison in Poland was closed down in late 2003 or early 2004.
"It obviously took a lot of effort to keep [the prison] secret," said John Sifton, whose firm One World Research investigates human rights abuses. "There's a reason this stuff gets kept secret."
"It's an embarrassment, and a crime."