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."
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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.
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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.
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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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