TAMZIN Outhwaite suffered a frightening experience on Freeze the Fear, which left her needing emergency medical treatment.
The 51-year-old banged her head after becoming trapped under the ice.
bravely plunged into ice-cold water but injured herself coming up for air.
Watching on, show presenter Holly Willoughby shouted: "She hit her head, she hit her head!"
Tamzin desperately gasped for air as she pulled herself out of the water.
She said: "Banged my head, I'm getting out."
FREEZE THE FEAR
Holly rushed to comfort Tamzin who said: "I might need to sit down."
Holly replied: "I know I feel like that too, we're going to get you checked out, okay and just make sure everything is okay."
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Tamzin was checked over by medics before being given the all clear.
The mum-of-two previously shared her fear over potentially suffering a heart attack - just like her mother.
The soap star - who played Melanie Owen in EastEnders - opened up to and , 29, on the BBC show after she tragically after a heart attack aged 67.
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Freeze the Fear with Wim Hof is the new BBC reality series which will see celebrities test themselves to the limits as they try to survive sub-zero challenges.
Holly presents the series alongside Lee Mack with Munya Chawawa and Yung Filly presenting a spin-off show on BBC3.