The remaining 11 recruits face a hostage rescue mission hoping to spring two abducted recruits. The second challenge is a punishing head-to-head team ammunition supply race in the jungle.

The recruits' will to survive is severely tested with an extraction task used in the Vietnam War. Then the recruits must make it through a survival task that requires navigating through the jungle while being pursued by hunters.

A new elite training team welcome 20 brave recruits to the searing, epic Jordanian desert, with an intense start crossing a ravine balancing on a rope suspended 165 feet above the ground, and escaping a room full of CS gas.

After a beasting on base, the teams are pushed to their physical limits as they race to pull vehicles weighing 1000kg from the sand while under indirect simulated fire. Calls from home unsettle some and prompt an honest reflection of the cost of war.

The recruits pair up for a 50-foot freefall off a cliff. They also face a brutal beasting in the desert, which pushes some recruits to the edge, and are forced to make a split-second decision about whether to fire in a combat situation.

The recruits try a seven-metre backwards dive and face an elimination sickener on a major sand dune. After hand-to-hand combat in murderball, they're ambushed while driving back.

After a set of tasks designed to test trust, including hand-to-hand combat and a terrifying abseil, Shylla's pushed to confront how a lifetime of racism has made her withdraw.

In the series finale, the last recruits are subjected to all kinds of punishing interrogation techniques. In the most feared phase of the course, they receive severe punishments, being buried alive, and thrown in water tanks, to force a confession.

The seven remaining recruits are ambushed by a hunter force team behind enemy lines. Handed over to interrogators for questioning, the recruits must endure psychological and physical punishments designed to break their will and force a confession.

The recruits are on the run across the punishing landscape, pursued by a military-trained hunter force, in a real life game of cat and mouse where only the strongest will make it through.

The remaining recruits face the final stages which consist of an interrogation and a brutal sickener. They must prove that they have both the mental and physical strength to complete the process.

The remaining men and women's final challenge is also the most psychologically demanding: resistance to interrogation, as they're subjected to stress positions, white noise and relentless grilling.

21 new recruits embark upon a recreation of the brutal SAS selection process, starting with an ambush, a hijack and a 100-foot abseil, which proves to be the toughest course to date.

The remaining recruits must cross a 200-metre gorge, swim beneath the ice on a frozen lake and navigate a perilous valley at night, while trying to avoid capture by a local hunter force and their dogs.

The recruits face a forward abseil and an arduous beasting by the DS. There's also an extreme water immersion exercise and a team event in a dark network of disused tunnels.

Led by Ant Middleton, 25 men and women - including an ex-SAS operator working as a mole - face the latest intense course, beginning with a swim to a remote Scottish island.

The recruits take on the intense close-combat murderball and surf immersion - a notorious water beasting that simulates water torture.

The recruits work in pairs as they tackle the threat of chemical warfare and execute a fast-paced extraction in near-freezing water. Then, it's time for brutal hand-to-hand combat.

The recruits are pushed to control their aggression, as they're trained with guns and take part in hand-to-hand combat, in an episode exploring loss, loyalty and self-control.

The recruits' grit is tested as Jay's undercover status is revealed and he launches a brutal beasting to expose the weakest in the group.

The remaining male and female recruits face gruelling challenges designed to test their mental and physical strength, including a 200-foot forward abseil and an infamous boxing task

The recruits must master their emotions under extreme pressure - from a scary backwards dive at night to an illusion jump. There is a further shock as the mole in their midst is revealed.

With the conditions deteriorating, the recruits must negotiate beastings in the snow and a night out in a blizzard 3000 metres above sea level, while the DS increase the psychological pressure on them.

The recruits are stalked across the Scottish Highlands by a military-trained hunter force, before facing extreme interrogation on limited sleep and rations. Who will crack?

Twenty recruits prepare to enter `Jungle Hell', the toughest phase of SAS selection. First they are tasked with traversing the 'trainasium', suspended 50 feet above the ground. Then they must complete a 200-foot abseil headlong into a waterfall.