This article was produced in partnership with the Pulitzer Center on Crisis Reporting.

GUANTÁNAMO BAY, Cuba — One of the accused conspirators in the Sept. 11, 2001, attacks was secretly recorded at Guantánamo admitting he funneled most of the funds that financed the hijackers who killed nearly 3,000 people 18 years ago, according to transcripts presented by prosecutors in a pretrial hearing on Tuesday.

The transcripts also portrayed the defendant, Ammar al-Baluchi, reading aloud a draft confession in a prison recreation yard on Nov. 25, 2008, describing it to another detainee as a statement he was working on with another man accused of conspiring in the attacks, Ramzi bin al-Shibh.

“If you consider my work and jihad against you on the 11th of September,” Mr. al-Baluchi is quoted as reading to the other prisoner, “to be terrorism or a crime, then I, with much pride, honor and dignity, announce it to all people that I am a terrorist and a first-class criminal.”

Mr. al-Baluchi then interjected, according to the transcript, that “Ubaydah,” Mr. bin al-Shibh’s nickname, “wrote this for me. I don’t know where he got this ‘first class.’”