New hi-tech equipment will be used today in the search for Coast Guard helicopter Rescue 116 off the Mayo coast.
Captain Dara Fitzpatrick was laid to rest yesterday while her colleagues Mark Duffy, Paul Ormsby and Ciarán Smith all remain missing.
The Irish Lights ship, the Granuaile has spent the last two days being fitted out in Galway to assist in the search, as rescuers try to take advantage of a weather 'window' later this afternoon.
The Coast Guard's Declan Geoghegan says there is a massive amount of organisation behind today's operation.
He said: "It's a combination of three agencies, the Irish Lights, the Navy Marine Institute and the Coast Guard working together in terms sharing equipment.
"So there will be sonar equipment and the diving equipment and the back-up in terms of a recompression chamber and generators."
