BBCA second teenager has died after getting into difficulty in the water near Buncrana in County Donegal.
The boy was rescued after a search operation and taken to Letterkenny University Hospital, where he died in the early hours of Sunday, gardaí (Irish police) have confirmed.
On Saturday evening the body of an 18-year-old male was recovered from the water.
A third teenage boy was also rescued from the water and taken to hospital.
Police said the local coroner has been notified and a post-mortem examination will be arranged in due course.
Gardaí investigations are ongoing.
The Irish Coast Guard told BBC News NI that an alert was raised shortly before 16:00 local time by a member of the public after reports there were a number of people in difficulty in the water.
The multi-agency operation was led by Malin Head Coast Guard with assistance from police and the ambulance service.
An Irish Coast Guard helicopter was also involved in the search along with the Royal National Lifeboat Institution (RNLI).
In a statement, the Irish Coast Guard thanked all the search and rescue units and members of the public who had assisted in the search.
