Game of Thrones.The actress has since opened up about a traumatic experience she faced while filming the HBO series.The 46-year-old detailed being strapped down on a wooden table and waterboarded for 10 hours on the set of Game of Thrones.Hannah admitted that the scene was the "worst day of my life" in a new interview.Viewers may recall her character Septa Unella being tortured by Cersei Lannister (played by Lena Headey).The actress, who also starred also appeared in Ted Lasso and Sex Education, admitted she first thought the waterboarding addition was a mistake after she was told she'd need a wetsuit top.Hannah explained: "There I was strapped to a wooden table with proper big straps for 10 hours.
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