Khaled Abdu Ahmed Saleh al-Maqtari, a 31-year-old Yemeni national, talked to Amnesty International about the more than 32 months he spent in the shadows of the CIA's black prison sites.
Here's the Amnesty International story.
In his first interview since being released by the Yemeni authorities in May last year, Mr Maqtari described the torture and ill-treatment he said he had suffered at the hands of the US military and CIA while in secret custody.
He describes being subjected to international crimes such as enforced disappearance and torture, yet these allegations have never been investigated
Anne FitzGerald
Amnesty InternationalHe said he was initially arrested in Iraq in January 2004, when the US military raided a suspected arms market in Falluja.
He is believed to have then been handed to US Military Intelligence on suspicion of being a foreign insurgent.
He said he was then transferred to Abu Ghraib, where he alleged he was subjected to a regime of beatings, sleep deprivation, suspension upside-down in painful positions, intimidation by dogs and induced hypothermia.
After nine days of interrogation at Abu Ghraib, Mr Maqtari said he was flown to a secret CIA detention facility in Afghanistan and held there for three months.
Amnesty says it has obtained flight records which show that a plane operated by an alleged CIA front company flew from Baghdad to Kabul nine days after his arrest.
Mr Maqtari sketched how he was allegedly tortured in Abu GhraibMr Maqtari said that while in Afghanistan he was subjected to further torture and ill-treatment, including prolonged solitary confinement, the use of stress positions, sleep deprivation, exposure to extremes of hot and cold, sensory deprivation and disruption with bright lighting and loud music or sound effects.
"It was not really music but noise to scare you, like from one of those scary movies," he told Amnesty.
"I was scared, there were no dogs but there was noise there. Whenever you try to sleep, they bang on the door loudly and violently."
During the lapses in the music and sound effects, he was able to speak to other detainees and deduced that there were about 20 others being held in the cell around him, including Majid Khan, one of the "high value" detainees transferred to Guantanamo Bay in September 2006, according to Amnesty.
Mr Maqtari said that in late April 2004 he and a number of other detainees were transferred to another CIA black site, possibly in eastern Europe and held there in isolation for a further 28 months.
The Council of Europe has found evidence that the CIA ran secret jails in Poland and Romania between 2003 and 2005 to interrogate suspects.
According to AI, the U.S. hasn't acknowledging detaining Maqtari.
While there's a legitimate question to be asked about what a Yemeni national was doing in Fallujah, Iraq in January 2004, and how he came to be near the location of a suspected arms market there, then why did it take 32 months before he was released -- let alone the torture along the way?