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.