Sixteen household names arrive in the desert, about to endure some of the harshest, most grueling challenges from the playbook of the actual Special Forces selection process.

Celebrities endure some of the harshest, most grueling challenges from the playbook of the actual special forces selection process; their goal is not to win votes and face eliminations -- for them it is just about survival.

The recruits are faced with an emergency escape drill; tensions begin to arise as the recruits confront each other over disagreements and the pressure of the selection process becomes too much to handle for some.

The celebrity recruits must have trust in each other and in their leaders in order to survive; each recruit must rely on another to break their fall from a skyscraping cliff.

The recruits face a skyscraping tactical repel and a high-pressure simulation.

The celebrity recruits learn a valuable lesson in using fear to inform and help.

The DS test the remaining recruits with a chemical warfare challenge; celebrity contestants reveal their personal stories that led them to signing up for the show.

The recruits find themselves back in the water with one of the most physically challenging tests thus far; as the group forms a deep emotional bond with one another, one recruit has a shocking exit.

The final group of remaining recruits attempt to go behind enemy lines without being captured, and face tough lessons of survival, leadership and how to decipher a map.

The last remaining recruits face their final phase -- enduring the mental duress of enemy interrogation.

A new troop of 14 household names face the harsh reality of winter warfare training.

The remaining recruits are tasked with submerging themselves in icy water and then simulate infiltrating enemy infrastructure by racing each other down a 330 foot dam.

The celebrity recruits are put to the test of safely protecting a convoy under a surprise attack.

As a test of their character, they are tasked with a 2-mile race, navigating treacherous terrain, while carrying a 220-pound boat.

The remaining recruits are taken to the top of a mountain range to face the most demanding exercise of selection so far using a single rope to crawl across a deadly ravine.

The recruits face the most dangerous task yet, a helicopter survival drill, as a test of their ability to mentally handle a life-or-death situation.

The recruits are taken to a remote mountain range where they are tasked with pulling sleds through two miles of dangerous terrain, then later escaping invasion from enemy hunters, before they take on their last 24 hours of selection.

The recruits are captured and taken into their final stage of selection: 12 hours of military-grade interrogation; resistance and the will to survive are key, and only the strongest recruits pass the course.

FOX's ultimate celebrity social experiment, Special Forces: World's Toughest Test, returns for a third season, enlisting a troop of household names to endure some of the harshest, most grueling challenges from the playbook of the actual Special Forces selection process. This time around, the recruits will be training in Wales, the home of British Special Forces Selection, and will endure the harsh reality of ocean warfare. On their way to base, and with hardly any time to get acquainted, the new recruits are faced with their first challenges which include taking a mighty leap out of a moving boat onto a helicopter, testing their endurance by treading water as a group and bungee-jumping off a 12-story viaduct.

Challenges include treading water as a group and bungee jumping off a 12-story viaduct.

The recruits face new challenges including escaping a boat crash and an intense combat exercise.

The recruits face new challenges including escaping a boat crash and intense combat exercises

Recruits must unlock a safe in a gas-filled room, perform a helicopter insertion into the blistering cold sea, and select recruits are forced to bury their teammates into coffins after cheating in a previous challenge.

The recruits must trust each other in order to survive.

Contestants take on a search-and-rescue course, crawl over a rope spanning a canyon and face a brutal three-stage endurance test

The recruits undergo a search-and-rescue course, crawl along a rope suspended over a canyon, face a grueling three-stage endurance test in the mountainous terrain, and a brakeman rope challenge.

Entering their final week of Selection, the remaining recruits are challenged mentally to harness their vulnerability and shift their mindsets to overcome the final tasks. The recruits fight the "Redman," escape an ambush and evade an enemy hunter base, and approach the most terrifying phase of the course, resistance to interrogation. As the recruits experience the most challenging part of their journey, they must try their best to conceal that they have been working with the Special Forces in order to successfully pass Selection.

As the recruits experience the most challenging part of their journey, they must try their best to conceal that they have been working with the Special Forces in order to successfully pass selection.

As the recruits make their way to base, they are faced with initiation and their first brutal challenge: repelling out of a military-grade helicopter. Later, the recruits get a taste of what it's like operating behind enemy lines as they carry supplies weighing 800 pounds in sweltering 100-degree heat.

The recruits are strapped inside an old cargo plane then lowered into a dam 215 feet below them, forced to escape underwater. Then, the recruits go head-to-head in an intense military-style boxing match.

With nothing more than a radio kit and each other, the recruits must communicate effectively and move quickly as they work together to identify fallen comrades in a casualty evacuation test behind enemy lines. Then, when their team's mission is compromised, they must cross rooftops to make it to extraction.

The recruits must focus as they plummet down a 330-foot drop, then at the bottom, they are asked to recite a set of coordinates which they were asked to memorize prior to the drop. Then, the recruits are split into teams and challenged to navigate through tight tunnels and trenches.

The recruits were split into teams and competed in a grueling race under the scorching heat, aiming to be the first to complete the course. This task tested their physical limits and ability to work together under extreme conditions.

The recruits are split into teams and face a high-stakes physical challenge: they must sidestep along a 165-foot rope suspended above a canyon floor, testing balance, coordination, and nerves. Once on the rope, the teams must fight to get a ball over the opposition’s goal line — turning the rope traverse into a competitive “murder-ball” style exercise under extreme conditions. The episode is described as pushing the recruits’ grit: physically, mentally, and as a team.

The recruits must perform under stress, but also learn from failure (as some pairs did) and improve their mindset. The staff keep pushing the notion that attitude matters as much as skill.

In one of the most intense physical challenges yet, the remaining recruits are split into two teams to attempt an extraction operation and are uplifted by heartwarming messages from home.

In the final week of selection, the recruits are subjected to a multi-stage process of interrogation and are placed under gradually increasing duress.