A woman is being treated in hospital after she escaped from a car that plunged into the sea.
A search operation is under way for a man who was also in the car, believed to have been driven off Arklow Pier in Co Wicklow at about 6am.
A Garda spokesman confirmed the woman was taken to Loughlinstown Hospital for treatment.
Rescue services remain at the scene and are trying to recover the man, he added.
The RNLI said it is believed the woman escaped from the car herself and raised the alarm as no one appears to have rescued her.
“The car is on the harbour very near the lifeboat station,” said a spokeswoman.
“It appears she got out herself because nobody has been able to say they got her out.
“They think they know where the car is and have attached a hook to it.”
Arklow RNLI, a Coast Guard unit from Courtown, local gardaí and firefighters are searching the water and coastline while Garda divers are due at the scene to carry out an underwater search.
It is understood no one on the pier saw the car smash through a barrier and enter the Irish Sea, which reached high tide shortly before 8am. Low tide will be about 3pm.
Rescuers said weather conditions are cold and windy, but that the harbour is sheltering the search area.
Winds are forecast to reach 28km/h in the county later today.