Final sequence shows seven prisoners being chained together with explosive necklaces, which are then detonated

Another group are shot with a grenade launcher while locked in an old car

Vile jihadis fighting for the Islamic State in Iraq have brutally murdered five prisoners by locking them in a metal cage and lowering them into a swimming pool.

Filmed in the ISIS stronghold of Mosul, 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.

Sickening: Filmed in the ISIS stronghold of Mosul, the horrific seven minute long video uses expensive underwater cameras to film the terrified men as they sink below the surface with no hope of escape

Lowered: Standing up straight with their legs bound, the men look reasonably calm until the moment the cage is slowly lowered into the pool by the depraved Islamic State militants

Horrific: As the water begins to enter the cage, the victims panic and start praying and pacing the cell

Brutal: Once the cage is submerged, the video cuts to high-tech underwater cameras, which - in images far too horrific to publish - show the men thrashing around until they lose conciousness and fall to the floor

The barbaric video is a new low for the terror group, whose catalogue of horrific filmed murders includes the savage beheading of several British and American hostages, the burning to death of Jordanian pilot Moaz al-Kasasbeh and numerous clips of people being shot and stoned to death.

The main section of the film begins with the stomach-churning sight of five men being locked in a tiny metal cage that has been suspended above a luxury swimming pool somewhere in the ISIS-held city of Mosul in Nineveh province.

Standing up straight with their legs bound, the men look reasonably calm until the moment the cage begins to be lowered into the pool.

As the water begins to enter, the victims start to panic, praying and pacing the tiny metal cell.

Once completely submerged, the video cuts to the high-tech underwater cameras, which show the men thrashing around until they appear to lose conciousness and fall to the floor.

The cage is then removed from the pool, with the dying men seen foaming at the mouths as they lie piled on top of one another under the blazing Iraqi sun.

Bound: The full seven minute video actually begins by showing a group of men wearing orange jumpsuits being led into a desert clearing. They are then locked in an Opel car, which is destroyed by a grenade launcher

Moments from death: The as-yet-unnamed victims were filmed sitting in the locked car before it is destroyed

Cowardly: Moments later a masked Islamic State jihadi appears carrying a huge grenade missile launcher

Fired from close range: The grenade launcher is fired towards the vehicle, causing it to burst into flames

Smoke: The car is seen in flames meaning the badly injured victims are likely to have burned to death

ISIS OFFER YAZIDI SEX SLAVE AS A PRIZE FOR MEMORISING KORAN IN SICK 'CELEBRATION' OF RAMADAN Jihadis fighting for the Islamic State have held a Koran memorizing competition in which the top prizes include a Yazidi sex slave. The photograph of an ISIS advert, believed to come from the northern Syrian state of Hasakah recently emerged on social media. As well as sex slaves, the advert promises cash rewards for fourth and fifth prize. The competition is set to be held in several ISIS mosques in Syria, including the Osama bin Laden mosque. The seven day competition is set to finish on 27 June and is being held to celebrate the Muslim festival of Ramadan. The advert addresses ISIS militants in Syria, congratulating the jihadis in their fight and wishing them a blessed Ramadan. Advertisement

The footage is actually divided into three separate sections, with different horrific punishments reserved for each group of doomed prisoners.

The full seven minute video actually begins by showing a group of men wearing orange jumpsuits being led into a desert clearing, before being locked in an Opel saloon car.

Moments later a masked ISIS jihadi appears carrying a huge grenade launcher, which he uses to fire a missile into the vehicle, causing it to burst into flames and burn the badly injured victims to death.

The film then cuts to interviews with another set of prisoners, where they 'confess' to the crimes they have been accused of and discuss how they have been treated by the Islamic State.

Next comes the harrowing drowning segment, which is followed by more interviews with prisoners.

The seven men are subsequently seen being led out into a field, where explosive cables are tied around their necks.

Seconds later the explosives are detonated, with HD cameras capturing the murder in full detail.

Several of the men are clearly decapitated by the massive blast, while others suffer horrific and fatal upper body injuries.

Doomed: Another harrowing sequence shows prisoners chained together with explosive necklaces

Sick: The seven men are led out into a field, where explosive cables are tied around their necks and detonated

Terrified: An ISIS militant checks the victims' explosive necklaces are secure before detonating them

Torture: The seven minute film includes interviews with prisoners, where they speak about the crimes they have been accused of and how they have been treated by the militants fighting for the Islamic State

ISIS STRING UP TWO BOYS FROM A BEAM AFTER ACCUSING THEM OF BREAKING THE RAMADAN FAST Savage jihadis fighting for ISIS in Syria tied two young boys to a beam by their wrists and left them hanging for several hours after accusing them of breaking the Ramadan fast. The shocking incident took place in the village of Mayadeen in Deir Ezzor province and involved boys 'aged under 18', according to the Syrian Observatory of Human Rights. It is understood ISIS' religious police force, known as the Hisbah, seized the two boys at some point over the weekend and suspended them from a pole in a public square. A placard was placed alongside them informing passers by that the pair were being punished for eating during daylight hours. 'They broke the fast with no religious justification', the notice said. Throughout the month of Ramadan, which began on Thursday, the majority of Muslims abstain from eating, drinking, smoking and having sex from dawn until sunset. Advertisement

The latest sickening murder video was released by ISIS' Ninevah branch, which is based in the terror group's stronghold, Mosul.

Yesterday it emerged that a US airstrike near the city killed an ISIS operative who was a person of interest in the 2012 Benghazi attack.

Pentagon spokesman Colonel Steve Warren said Ali Awni al-Harzi of Tunisia was killed on June 15.

The US Treasury and the State Department had designated him as a terrorist operating for radical groups.

'His death degrades ISIL's ability to integrate North African jihadists into the Syrian and Iraqi fight and removes a jihadist with long ties to international terrorism,' Warren said referring to ISIS.

Harzi was considered a person of interest in the militant attack on the US mission in the eastern Libyan city of Benghazi on September 11, 2012, that killed the American ambassador and three other Americans.