Some were subjected to tests on their knowledge of the Koran with scores determining whether they would live, die or be tortured
THE horrifying reality of ISIS's terror reign over everyday Syrians is made clear in this snapshot of life inside the group's torture chambers.
Dozens of inmates were kept in tiny conditions inside the dilapidated Manbij building.
The city was only liberated by Syrian and Kurdish forces a fortnight ago.
But the horror of the regime's hold was revealed when BBC reporter Jiyar Gol visited the squalid prison.
Infested with cockroaches and using only a tiny window for light and air, the holding cells held ISIS opponents as they awaited a decision on their fate.
Many would go on to be executed.
And the simplistic method of choosing between life and death could often be a multiple-choice test.
Extremists would quiz inmates on their knowledge of Islam and the Koran.
Those who scored less than 50 per cent would likely face torture.
Prisoners whose mark dipped below 20 per cent faced an even worse fate.
As many as 14 inmates were crammed into a tiny room with a small hole in the ground to use as a toilet.
Others faced the terror of the solitary confinement cell, where inmates could only stand upright as they stared against a cast iron door.
A Kurdish liberator, showing Gol around the facility, explained they "held many local people here in the cells".
He goes on to describe how the goal of the twisted ideologues was to "break the will" of their terrified prisoners.
The liberation of Manbij comes as Kurdish forces slowly roll back ISIS-held towns across Iraq and Syria.
The northern Syrian town was once home to 100,000.
Kurdish YPG forces are slowly advancing towards Raqqa – the self-styled Islamic caliphate’s capital.
Kurdish and Iraqi forces have liberated dozens major towns and cities such as Fallujah, Ramadi and Kobane in recent months.
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