Recruits return to base camp for a final debrief with the DS, sharing stories from their life-changing experience on SAS selection.

The final four recruits face their greatest test – a petrifying helicopter insertion into enemy territory where they must cover their tracks before retrieving a bag from a 100 metre high cliff face.

Recruits gather all their strength for a bone-chilling ice pit plunge and a torturous trek through dense mangroves, while the writing of death letters tests their emotional resilience.

A DS cull is on the horizon as recruits enter the final days of selection. Tonight, they will attempt the longest cat crawl of any course in blustering winds above a crashing ocean.

A day of cold water torture pushes the exhausted recruits to their limits, and tears flow when they reveal their most shameful secrets.

Recruits summon all their courage to survive one of the most harrowing tasks on selection, but the debilitating exercise proves too much for one.

The pressure intensifies as recruits navigate a helicopter ladder crossing and the DS show no mercy on the punishing log haul task. Pauly comes under fire from all directions..

In a heart-stopping abduction scenario, recruits must escape from the trunk of a moving car, bringing out reckless behaviour in some.

Recruits take part in an extreme tug of war. Facing off against each other, the loser will be dragged off a 100 metre cliff. An assault course will leave them bruised and battered.

Friction among the recruits explodes as leadership is put to the test in a brutal Navy SEAL surf battle and a gruelling team waterfall climb.

Recruits face a high adrenalin task as they leap from a moving zodiac into a moving helicopter. Pepper spray conditioning pushes some over the edge. Only with the right mindset will they succeed.

Entering a dark tunnel filled with obstacles and water, recruits must remain adaptable and battle claustrophobia. Tensions boil over as the recruits attempt to work together.

Celebrity recruits must remain calm in a terrifying balancing act high above a factory floor. Later, they face a dangerous Navy SEAL drowning survival test called 'the beehive'.

Seventeen celebrity recruits have the guts to sign up for the most brutal Special Forces selection course. Their first initiation is to be set on fire, and then survive a plane crash simulation.