One shows the prisoner nude and strapped to a crude gurney, his entire body clenched as he is waterboarded by an unseen interrogator. Another shows him with his wrists cuffed to bars so high above his head he is forced on to his tiptoes. They are sketches drawn in captivity by the Guantnamo Bay prisoner known as Abu Zubaydah, self-portraits of the torture he was subjected to during the four years he was held in secret prisons by the C.I.A.. In each illustration, Mr. Zubaydah ... portrays the particular techniques as he says they were used on him at a C.I.A. black site in Thailand in August 2002. They demonstrate how, more than a decade after the Obama administration outlawed the program - and then went on to partly declassify a Senate study that found the C.I.A. lied about both its effectiveness and its brutality - the final chapter of the black sites has yet to be written. Mr. Zubaydah, 48, drew them this year at Guantnamo for inclusion in a 61-page report, "How America Tortures," by his lawyer, Mark P. Denbeaux, a professor at the Seton Hall University School of Law in Newark, and some of Mr. Denbeaux's students. The report uses firsthand accounts, internal Bush administration memos, prisoners' memories and the 2014 Senate Intelligence Committee report to analyze the interrogation program. The program was initially set up for Mr. Zubaydah, who was mistakenly believed to be a top Qaeda lieutenant. He has never been charged with a crime.