The camp consists of several well-disguised dug-in structures connected by tunnels.
One of the militia fighters told Sputnik that the camouflaged facility was discovered during a sweep in the vicinity of Ar-Rutbah, a town located in the western part of Anbar province.
"This camp was used to train the so-called Daesh elite forces. It was difficult to reach the place by vehicle, and it was hard to detect because it was well camouflaged," he explained.
The fighter also added that the terrorist group’s toughest troops were deployed from this camp to battle Iraqi armed forces in Fallujah, ar-Ramadi and other liberated cities of Anbar province.
During the sweep of the camp, soldiers discovered weapons, training facilities and equipment needed to manufacture explosive devices. Also, the camp contained recreation facilities where terrorists could relax after fighting in Iraq and Syria.