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The Big Brother house has been evacuated after it was flooded during a heavy thunderstorm.
A clip uploaded to YouTube shows contestants scream with panic as water gushes from the ceiling into the living room as the roof caved in.
The show's producers reacted quickly to order housemates out of harms way.
A message then sounded on the tannoy which said: "This is Big Brother all housemates must enter the bedroom immediately.”
The contestants have temporarily been moved to the Other House at the set in Elstree Studios in Borehamwood.
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The caption on YouTube read: "While some housemates enjoyed an epic rain storm, the Big Brother House itself developed a little problem! Housemates have now been temporarily evacuated to the Other House."
Big Brother aired on Channel 5 at 9pm.