The recruits go head-to-head in a terrifying hang-tough task 160 feet above a quarry - testing mental and physical strength. Then they take on a car ambush task where they must drive into a simulated war zone, pick up an ally, and vacate hostile territory into a safe zone, intact.

The remaining celebrity recruits face a final, brutal challenge at the El Morado glacier, 3000 metres above sea level. A dozen celebrities started, but only a few have what it takes to complete the course.

For the series finale, the five remaining celebrities endure intense interrogation. The interrogators subject the exhausted and hungry recruits to punishing techniques as they attempt to unpick their cover story and reveal their true mission.

Chief instructor Ant Middleton and his directing staff put the celebrity recruits through a series of tests. One celebrity recruit collapses on a mountain and another is badly affected by the extreme cold, as they face brutal challenges.

Twelve celebs remain deep in the punishing environment of the Vietnamese jungle. Their trust in each other and themselves is tested in a task so gruelling that they start dropping like flies.

Rebecca Loos, Louie Spence and Conor Benn are among the 14 celebrities taking on the most challenging selection course in the world. This series comes from Wales, the birthplace of the Special Forces. For their first task, the celebs must plunge into the freezing sea, swim to a rendezvous point and attempt to jump onto a moving speedboat.

For the penultimate phase of the course it's survival of the fittest during a bout of pontoon wrestling. The remaining recruits are then ordered to head off into the jungle on a risky mission behind enemy lines.

The celebs face a punishing search operation through a series of rooms filled with CS gas. And they're tested under pressure during a rescue mission when they're tasked with extracting two of their fellow recruits who've been taken hostage.

The celebs first climb up a 200-foot cave, and abseil back down again. The second task is murderball: a serious test of physical strength and aggression. Finally, the recruits must write a 'death letter' to their loved ones.

From the recruits' very first challenge - a terrifying backwards dive out of a helicopter - Ant Middleton and his team are determined to show there will be no allowances made. Later, the celebrities have to overcome more fears.

As the pressure is piled on, one recruit cracks and a bad decision puts another's place on the course in dire jeopardy. After being pursued through the Chilean countryside by a military hunter force, the recruits enter the interrogation phase.

The last seven celebs face the final brutal phase with a punishing interrogation with ice baths and burial to force a confession. Will they crack or make it through to the end?

The celebrities are paired up to prove that they're team players, and must put their lives in each other's hands, in a terrifying free fall abseil. They must leave their celebrity world behind and learn to trust their partner to keep their place.

16 celebrity recruits are pushed to their limit in the unforgiving Vietnamese jungle. The new recruits must first traverse parallel metal bars suspended 50 feet above the ground. Then they must fight against each other in the rawest form of combat.

The celebrities face the penultimate survival phase of the course, where they prepare for life on the run behind enemy lines. An ambush triggers traumatic memories for AJ Pritchard. Messages from home threaten to unsettle the recruits ahead of the escape and evasion phase, while Calum Best leads his team astray as they try to avoid capture by a relentless Hunter Force

The remaining eight celebrities must pull themselves across a 300-foot-wide ravine, before dropping 160 feet to the extraction point. Then to weed out the weakest recruits, the celebs take a midnight beasting, and make an emotional call home.

The celebrity recruits must jump from a helicopter in pairs. Next, they take the life of a teammate in their hands as one of them free-falls from a 150-foot cliff, being kept from crashing to the ground by their partner.

The recruits take on the gruelling task of moving a broken-down one-tonne Jeep in searing heat and through thick sand. Then the celebs must balance on ropes 160 feet above the ground to cross a ravine.

The recruits must make split-second decisions about whether to shoot in a simulated warzone. Then the recruits are forced to dive backwards from a seven-metre platform into the Gulf of Aqaba in the dead of night.

14 celebrity recruits face the toughest course to date, played out in the unforgiving terrain of the Jordanian desert. The recruits face an intense start to the course, crawling through sand in blistering 40-degree heat, before facing a gas attack.

The recruits compete in three brutal challenges that test their leadership skills. First they must construct a zipline, then go head-to-head in murderball, and finally they must work out how to pull a 200kg sled loaded with equipment up a revine.

Twelve celebrities, from Katie Price to Joey Essex, leave their glamorous homes to take on the SAS selection course, the toughest challenge of their lives. Who will pass this test?

In the second selection phase, the celebs face murderball, a brutal beasting, a backwards helicopter dive into near-freezing waters, and a few home truths.

The recruits are put in pairs to eat, sleep and work as a duo, including a 60-metre cliff drop together. Can leaders Joey Essex and Lauren Steadman do teamwork or are they at risk?

The recruits face a killer 48 hours primed to expose the weakest members - including a beach beasting in near-freezing water and a gruelling race across mountainous terrain.