The sickening seven minute long video uses expensive underwater cameras to film the terrified men as they sink below the surface with no hope of escape. Shortly afterwards the cage is lifted back out of the water, with the dying men – who are understood to have been accused of spying – seen foaming at the mouth as they lie motionless on the floor of the cage, piled on top of one another. Elsewhere in the video, ISIS militants are filmed brutally killing prisoners by locking them in a car and shooting them with a grenade launcher, while another group of jihadis chain a set of prisoners together with explosive necklaces which are then detonated.
