SAS Australia

Celebrities undertake a series of extreme tasks, including jumping backwards out of a helicopter and hand to hand combat, as they begin the challenge of completing the gruelling SAS selection course.

Recruits are pushed to tackle their fears head on in a 60m high forward abseil, while a brutal game of murderball on a black mud plain leaves one recruit with a near concussion.

In an abandoned abattoir, recruits face a life or death decision before they are drilled physically into the early hours of the morning. Will they bow out from exhaustion or find the true grit needed?

In freezing waters with plummeting body temperatures, recruits wait to be rescued by their teammates before they face a test of pure grunt and teamwork. An emotional departure surprises the group.

In a punishing day, recruits crawl across a jagged ravine on a single rope above the ocean; are submerged in crashing, cold surf; and face a physical drilling that leaves them on the brink of collapse.

The fatigued recruits drop from a helicopter into 4-degree water carrying 20kg backpacks, before making their way to shore as a group then racing to the top of a mountain.