A suspect is carried into Camp X-Ray at Guantanamo, where a report revealed inmates were regularly tortured using waterboarding and other brutal techniques
Al-Sharbi is one of 61 terror suspects still being held in Guantanamo Bay.
During the conversation, al-Sharbi appears to be struggling with illness. He tells the board he had just come from the detainee hospital, is "really exhausted, and nauseous and lethargic," and uses what is described as a "manual breathing device".
He also claimed an unnamed member of the Saudi royal family was part of an effort to recruit him for extremist acts before the September 11 attacks.
He said a religious figure in Saudi Arabia used the term "your highness" during a telephone conversation with a man, just before urging al-Sharbi to return to the US and take part in a plot against the US that would involve learning to fly a plane.
The September 11 commission found there was no evidence to indicate the Saudi government as an institution or Saudi senior officials individually had supported the attacks, and the kingdom's government has consistently denied it had any role in the plot.
In July, the review board declined to approve al-Sharbi's release from Guantanamo.
The Saudi embassy in London has been contacted for comment.