The search for a missing teenager in Lough Swilly is due to resume around now, with coastguard urging all volunteer searchers to make sure they wear proper clothing and take extreme care.
Sean McNair hasn't been seen since the early hours of Sunday morning.
The 17 year old from Derry went missing in the water while swimming with friends at Rathmullan pier.
Search efforts have been hampered by poor weather conditions.
Derek Flanaghan, of the Irish Coastguard is coordinating the search, he says conditions are slightly better today...