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The clip reveals cramped and squalid rooms, believed to have been used by the depraved death cult to punish women who defied their orders. The awful discovery was made after Syrian rebel fighters liberated the city of Manbij.

IG Eerie footage shows the conditions of the prison

Rebel fighters said they found tools, sexual stimulants, contraceptives and drugs inside the sex-prison. Group leader Omar Mazerli said: "We found various kinds of pills, including sexual stimulation, contraceptives and narcotic pills which were used by the Islamic State group for torture. "They have very strange ways. This place was very hard to find and it is well hidden, but we got here with God's will and the efforts of the Military Council."

IG Writing was scrawled onto the walls

IG A comb was left on a pillow in the prison

God, I have wronged myself, and no one forgives sins but you. Forgive me, you are forgiving and merciful

The eerie video shows stained pillows, dog bowls filled with discoloured liquids and writings on the wall. The writing, which is in Arabic, read: "God, I have wronged myself, and no one forgives sins but you. Forgive me, you are forgiving and merciful." Prison-like doors are on each of the cells, with dirty towels littered around the mouldy rooms.

Migrant crisis: Key locations before and after Tue, April 4, 2017 In these composite images, a comparison has been made between a scene at a key location during the height of the 2015 migrant crisis last year and the view there now Play slideshow Getty Images 1 of 10 Aid workers help migrants up the shore after making the crossing from Turkey to the Greek island of Lesbos on November 16, 2015 in Sikaminias, Greece