The Islamic State (IS) has released a new video showing a series of executions aiming to reach new heights of depravity, with men drowned in a cage and beheaded by explosive necklaces.

The seven-minute video, which surfaced Tuesday, shows several different executions of men IS accuses of being spies. Most notably, one execution shows five men are locked into a cage which is slowly lowered by crane into a swimming pool, with underwater cameras prepared in order to show the men frantically thrash about until they lose consciousness. The cage is then shown being raised, with the five men dead in a heap at the bottom, foam flowing out of their mouths (a sign of recent drowning).

Prior to their deaths, videos are shown of several of the victims "confessing" that they infiltrated IS as spies in order to pass intelligence to the Iraq government.

An ISIS prisoner ‘confesses’ to espionage prior to his execution by drowning. (Screengrab)

An ISIS prisoner ‘confesses’ to espionage prior to his execution by drowning. (Screengrab)

The video shows several other executions. In one, prisoners are locked inside a car which is then blasted with a rocket-propelled grenade. In another, seven men are tied together at the neck by a daisy chain of explosives. The explosives are then detonated, killing the men.

ISIS prisoners tied together at the neck by explosives. (Screengrab)

ISIS prisoners tied together at the neck by explosives. (Screengrab)

ISIS shooting a car with an RPG to execute prisoners. (Screengrab)

ISIS shooting a car with an RPG to execute prisoners. (Screengrab)

Like with other IS execution videos, the victims appear quite passive as their executions approach. For instance, the men about to be drowned do not appear very distressed until they are about to go under. Such docility is frequent with IS executions, and is apparently achieved by through frequent "rehearsal" executions that develop a false sense of security for prisoners. (RELATED: ISIS Defector Describes 'Mind Games' With Hostages Before Beheadings)

The new horrors come just days after news emerged that IS had supposedly executed two boys for breaking the Ramadan fast.

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