Watched a documentry from the Soviet Afghan era. Possibley about Ahmad Sha Massoud (Lion of the Panshir).
There was a Cuban prisoner (I think) who they kept alive simply because he wouldn't speak,why that was the case I don't know.
It was pretty disturbing as his compatriot was in a shallow grave,with a foot sticking out of the ground nearby & his captors kept making the throat cutting sign.Very unpleasant!