A Naval Service dive team with specialist search equipment has been deployed by the Defence Forces to assist in the search for missing teenager Seán McNair continued off the Donegal coast.
The team have completed their first dive and will carry out a second before last light this evening. They will remain at the scene over the coming days.
The search for the missing 17-year-old has been hampered by stormy weather conditions with heavy gales preventing boats from putting out to sea.
The searches, under the guidance of the Greencastle Coast Guard and the Mulroy Coast Guard, stretched for miles along both sides of Lough Swilly.
The Sikorsky search and rescue helicopter from Sligo did manage to take part in the operation for a small time yesterday afternoon.
Seán McNair, from Derry, was last seen in the early hours of Saturday morning when he went swimming with friends off Rathmullan Pier. The group had been celebrating a friend's 18th birthday party in a nearby pub.
Since then his family and friends, including his mother Jackie, have kept a vigil at the small seaside village.
Local priest Fr Martin Collum has been at the scene since the youth went missing.
He paid tribute to the work of all the search and rescue teams who are trying to locate the missing teenager.