Footage has emerged of a prison in the Syrian Desert where the Islamic State kept female Yazidi prisoners.
They were held in tiny cramped underground dungeons covered with manhole covers.
The prisoners left drawings on the walls of the cells where they were forced to eat, drink and sleep. The prison was liberated by Kurdish fighters but it is not known where the women who were kept there are now.
It is also not known whether or not the prisoners were used as sex-slaves.