Abu Zubaydah, a Pakistani citizen, was captured by the CIA in 2002 and renditioned to several CIA dark sites in Poland, Lithuania and elsewhere, until he was transferred to Guantánamo in 2006, where he has been held ever since without charges. The now 52-year old has created a series of 40 drawings showing the torture he endured during his detention. "Abu Zubaydah is the first person to be tortured, having been approved by the [US] Department of Justice based on facts that the CIA knew to be false,” says Prof Mark Denbeaux, one of his lawyers. Last week, the UN called for him to be set free immediately, finding that his ongoing detention may be a crime against humanity.

Warning: the images and descriptions of torture in this article are extremely graphic.