How far should we go in the fight against terrorism? Panorama hears from those who approved, ran and suffered waterboarding in secret CIA prisons around the world.

How far should we go in the fight against terrorism? Enhanced interrogation methods used by America in the aftermath of 9/11 - including the technique of controlled drowning known as waterboarding - have been condemned as torture. Panorama lets you decide as it recreates what was done, and hears from those who approved, ran and suffered the programme in secret CIA prisons around the world.