The Coastguard helicopter is assisting in the search
A man is missing off the Doonbeg coast in Co Clare.
It is believed he was fishing at the time and the alarm was raised on Saturday morning.
The Shannon-based Coastguard search and rescue helicopter was sent to the scene.
The Kilkee and Doolin units of the Coastguard is also assisting in the operation.
Gerard O'Flynn from Coastguard operations says divers may join the search later.