SAS Australia

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.

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.

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 are brutally awoken by the sound of gun fire and a botched rescue attempt unfolds. Messages from home test the recruits’ emotional resolve while a relentless pack march takes its toll.

In a dangerous backward fall, the life of the jumper is in the hands of a fellow recruit. During an honesty test, some gobsmacking truths are shared. And a simple mistake results in a serious injury.

Recruits race up a snow-covered mountain dragging a 60kg sled. Exhausted, they must then swim under ice, battling hypothermic conditions, only to discover the weakest will be sent home.