The guy "Ahmet" in Midnight Express, who was an Oxford educated character (?), spoke good English and had a degree in philosophy was locked up underground in a Turkish jail, where they meet. Is it known what Ahmet was there for, which crime he was convicted for or is it not said?
According to the script:-
AHMET ...They put me here. They say I raped a little boy. I have been here very long time. They will never let me go.