The volunteer lifeboat crew was requested to launch their inshore lifeboat at 7.12am following a report of a potential tragedy at Helvick Pier on the Co Waterford headland.
On arriving at the car park, the crew observed a crashed car. The lifeboat took to the water immediately and within seconds shore helpers spotted a casualty in the water.
Once on scene with the casualty, crew members Shane Breathnach and Dónal Ó Faoláin entered the water to assist.
The casualty, who was struggling to stay afloat, was helped into the lifeboat where he was treated for hyperthermia by helm Shay Young and crew member Cathal Reilly.
The man was then returned to Helvick Lifeboat Station where he was cared for until the ambulance arrived and he was transferred to hospital.
"It was a close call this morning and we would like to commend local fishermen Barty Whelan and Richard Tobin who were active on the shore in raising the alarm, spotting the casualty and remaining on site," said Young following the callout.
"Once on scene, it took all four of us aboard the lifeboat to bring the man in and do what was necessary. We would like to wish the casualty a full recovery following his ordeal."