Celebrity SAS: Who Dares Wins stars line up for the new show before being gassed on their first day.
They faced a mock chemical weapons attack to experience the effects of CS gas as part of the new series of the celebrity edition of the popular Channel 4 show.
EastEnders alum Maisie Smith branded it "hideous". She further commented about it: "I couldn't breathe with the mask on. Part of me was saying, 'Am I actually dying?'."
The Only Way Is Essex (TOWIE) alum Ferne McCann commented: "That was the worst experience of my whole life." The reality TV star added: "It was horrendous."
Other celebs in the line-up include Love Island star Curtis Pritchard and former footballer Ashley Cain, who spar with each other as part of a boxing match in a desert.
They are joined on the new series of Celebrity SAS: Who Dares Wins by Love Island winner Amber Gill, fellow TOWIE alum Pete Wicks as well as Brookside actress Jennifer Ellison.
TV personality Calum Best is also part of the line-up this year, alongside Curtis' brother AJ Pritchard - who is best known for having been a professional dancer on Strictly Come Dancing.
Channel 4 viewers will also get to see several athletes put through their paces when the reality TV show returns later this week, including Olympic sprinter Dwain Chambers.
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Taekwondo athlete Jade Jones and javelin thrower Fatima Whitbread are also part of the line-up, with both of them having won Olympic gold medals in their careers.
Professional boxer Shannon Courtenay and Paralympic high jumper Jonathan Broom-Edwards complete the line-up for the new series, which will launch over the coming weekend.
Former US Marine Rudy Reyes - who returns as chief instructor - said: "SAS is renowned for having the highest standards. [...] We demand full throttle excellence no matter celebrity, title or fame".
The new series of Celebrity SAS: Who Dares Wins starts on Sunday (September 4) at 9pm on Channel 4. Episodes will be available for catch up through streaming service All4.
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