Nearly a decade after C.I.A. interrogators tortured a Saudi man suspected of involvement in Al Qaeda’s bombing of the American destroyer Cole in 2000, the prisoner continued to experience lingering psychological consequences, including “nightmares that invoked being chained, naked and waterboarded,” newly declassified documents show.

The detainee, Abd al-Rahim al-Nashiri, is facing the death penalty over charges before a military commission at Guantánamo Bay that he helped plot the Cole attack, which killed 17 sailors, as well as an attack on a French-flagged oil tanker in 2002 that killed a Bulgarian man. The newly declassified documents are part of a petition in a related case his lawyers are filing with the Supreme Court.

The new details add to the growing public understanding of what American officials, desperate to get information out of Mr. Nashiri that they hoped would stop terrorist attacks, did to the prisoner. They also show how that treatment created long-term consequences. When Bush administration lawyers authorized the so-called enhanced interrogation techniques in 2002, one of their premises was that the program they enabled would inflict no lasting damage to the prisoners.