SAS Australia is returning to Channel Seven for a second season this Monday, and if ever there was a time Australia needed to see celebrities pushed to their limits, it would be now.

The show will see 18 celebrities put to the test in a series of physical and psychological challenges plucked from the real SAS selection process.

Cut off from the outside world, the contestants will eat, sleep and train together in incredibly tough conditions: extreme physical endurance, sleep deprivation, interrogation and psychological testing.... to name a few.

Watch the trailer for the last season of SAS Australia. Post continues after video.

The contestants are put through the course by an elite team of ex-Special Forces soldiers, including Chief Instructor Ant Middleton and his DS (Directing Staff) Mark 'Billy' Billingham, Jason 'Foxy' Fox and Ollie Ollerton, who are all back from season one.

Recruits arrive with absolutely no possessions and are issued everything they need to survive the Snowy Mountains in their "Bergen".

That includes:

Here's everything else we know:

TheSAS Australiaair date.

SAS Australiapremieres 7.30pm Monday, September 13 on Channel Seven.

TheSAS Australiacontestants:

SAS Australia: Mark Philippoussis

Former Tennis Player, Mark Philippoussis is looking to "get out of his comfort zone, and get pushed to the limits."

"I'm feeling excited, anxious, a touch scared," he said.

"It's the same feeling as walking onto those [tennis] courts. It's exciting because I haven't felt that in a very long time."

SAS Australia: Brynne Edelsten

Socialite, Brynne Edelsten has joined the SAS lineup to prove she is "more than just Geoffrey Edelsten's ex wife."

"I'm scared of everything," she said.

"I'm not a gold digger, I can get through anything."

SAS Australia: Manu Feildel

Celebrity chef and reality star, Manu Feildel will be joining theSAS Australialineup.

"In the kitchen you need to stay calm and handle the pressur