The teenage star of Smother had to overcome his terror of water to film a frightening ocean scene in the hit series.
James O’Donoghue, who plays troubled Calum in the RTE drama, had his head plunged under the sea for several seconds in one episode – which took weeks of preparation.
Despite living in coastal Wicklow and going to school in Dun Laoghaire, the 18-year-old said he never went near the ocean.
