The incident happened off Wexford's Hook Head this evening.
The father of four in his forties was taking part in an underwater search for a fisherman who went missing from a trawler off the Saltee Islands yesterday morning.
The alert was raised shortly after noon today as he returned to the surface after a dive.
He was treated by colleagues at the scene and airlifted to University Hospital Waterford where he has since been pronounced dead.
East Coast FM's Jack Massey Among Ten Selected for the Learning Waves Journalism Graduate Programme
East Coast FM's Jack Massey Among Ten Selected for the Learning Waves Journalism Graduate Programme
New Water Mains In The Pipeline For Delgany
Works will begin on Church Road next week for "A water supply people can count on".
Wicklow Secondary School Demand Largely stable, says Department
Some areas will see modest growth while Arklow and Tullow face a decline.
€8.65Bn Budget Package To Include Higher Tax Band, €10 Welfare Rise & €1,000 Cut In Childcare
Budget 2027 - Wicklow TD Simon Harris delivers his Budget in the Dáil from 1pm, with workers, families and rural households all in line for support.
Online School Application System Open To More Wicklow Families
Kilcoole's Coláiste Chraobh Abhann joins three Greystones schools in the expanded Apply to School scheme.
Sunny intervals
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High: 14°C | Low: 8°C
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High: 13°C | Low: 5°C
Sunny intervals
High: 13°C | Low: 5°C
