A sign fixed to the entrance of America's military camp in Guantanamo Bay reads: "Honor bound to defend freedom".

It is an interesting choice of words for a military prison which holds up to 600 Muslims in tiny cages.

None of its detainees have been charged with any offence and for a long time none were allowed access to a lawyer. Many claim they have been tortured.

Camp Delta, in Cuba, has been described as a legal black hole in which hundreds of men are languishing with little hope of reprieve any time soon.

The President Versus David Hicks focused on the battle of an Australian father to find out why his son ended up in this black hole.

As Terry Hicks retraced his son's steps across Pakistan and Afghanistan, the documentary begged more questions than it answered. But there was no mistaking the moral force of his simple plea that his son be released or put on trial.

In the debate following the screening the audience was reminded that former Brighton resident Omar Deghayes remains in Camp Delta, where he has been a prisoner for more than two years.

Visit www.save-omar.org.uk.