Emma Corrin Revealed She Was Hospitalised After Shooting "The Hardest Scene To Film" In "The Crown"

Corrin, who plays Princess Diana in the royal drama, recalled: "The doctors gave me an oxygen test and said, 'We cannot let you go because your oxygen levels are so low.'"

Everybody and their watchlist breathed a sigh of relief over the weekend as Season 4 of The Crown finally dropped on Netflix after months of anticipation.

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This season of the royal drama is already being coined as the best yet, not least because the likes of Princess Diana and Margaret Thatcher are being introduced into the mix for the first time.

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Taking on the iconic role of the "people's princess" is Emma Corrin, who settles into the role with ease and bares a striking resemblance to a young Diana.

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But, in a recent interview, Corrin revealed that she was actually hospitalised while filming The Crown after shooting a scene in a swimming pool while on location in Spain.

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"I'm asthmatic and I had been ill for a while with a bad cough," Corrin explained in an interview with Glamour. "I had to film a scene in a freezing-cold swimming pool, with the kids playing William and Harry."

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The scene was difficult to shoot, not least because Corrin had to keep herself and the young actor playing Harry afloat.

She said: "It was honestly the hardest scene to film because I was genuinely keeping myself alive treading water, and also keeping 5-year-old 'Harry' alive, as we found out he couldn't swim!"

But on the night that she was meant to fly back to the UK, Corrin stopped off at the hospital for medication, only to be told that she needed to stay because her oxygen levels were dangerously low.

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"We were meant to be flying back that night to the UK, so we went past a hospital to get me antibiotics," she recalled. "The doctors gave me an oxygen test and said, 'We cannot let you go because your oxygen levels are so low,' so I was hospitalised."

The medical staff soon realised who Corrin was, and who she was playing in The Crown, and went as far as to offer her a makeshift disguise to keep her hidden.

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She said: "I remember the nurses, figuring out what I was filming and saying, 'We know you're playing Princess Diana, would you like us to put a cardboard bag over your head so no one recognises who you are?' in broken English!"

You can read Emma Corrin's full interview with Glamour here. Season four of The Crown is streaming now on Netflix.