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.

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.

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

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

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

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.

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.

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.

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 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.

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.

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

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 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.

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

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.

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

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

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