Phoebe Dynevor was determined to give an authentic childbirth portrayal in Thrash Thrash star Phoebe Dynevor has explained how she was "obsessed" with doing justice to her character's childbirth scene in the Netflix shark movie. 13 April 2026 Phoebe Dynevor was "obsessed" with perfecting the childbirth scene in her movie Thrash. Phoebe Dynevor plays an expectant mother in Thrash The 30-year-old star plays expectant mother Lisa Fields in the Netflix shark thriller and explained how she and co-star Whitney Peak painstakingly prepared for the scene where her alter ego gives birth in the water.