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.
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8:00pm - 10:00pm
Love Songs on the Coast
Sunny intervals
High: 17°C | Low: 12°C
Sunny intervals
High: 17°C | Low: 13°C
Sunny intervals
High: 17°C | Low: 10°C
Sunny intervals
High: 18°C | Low: 10°C
Sunny intervals
High: 17°C | Low: 10°C