Game of Thrones star Hannah Waddingham developed chronic claustrophobia while filming torture scenes for the series. Playing Septa Unella, a foil to Cersei (Lena Headey), left Waddingham feeling traumatized. The intense waterboarding scene, where The Mountain (Hafþór Júlíus Björnsson) tortures Unella at Cersei's command, was particularly harrowing. Waddingham's experience was so traumatizing that it led to long-lasting effects. Game of Thrones, based on George R.R. Martin's books, follows power struggles in Westeros. Cersei faces humiliation orchestrated by Septa Unella before seeking revenge. The show's brutal scenes have left a lasting impact on Waddingham, highlighting the toll that filming intense moments can have on actors.