A search resumes in Galway Bay this morning today for a 32-year-old woman reported missing from Silver Strand, Barna, on Tuesday.
Vessel owners and other volunteers have been asked to register with the Garda, which set up a control unit at Silver Strand.
All non-motorised vessels, as in kayaks and stand-up paddleboards, will be assigned groups and zones at 8 am on Thursday at Silver Strand.
Shore walkers have been asked to meet at Séipéal Barna, Barna chapel, at 7.45 am to be assigned search zones.
The young woman, named locally as Máire Ní Fhatharta of An Spidéal, was reported missing after she failed to show up at work on Tuesday morning.
A second swimmer who died off Silver Strand near Barna on Tuesday has been named as musician, composer and writer Johnny Duhan.
Both swimmers had gone out separately. While seas were calm, a dense fog had covered Galway and Barna throughout Tuesday.
The foggy conditions over the last two days precluded the Irish Coast Guard Shannon rescue helicopter from joining the search on Tuesday, but Rescue 117 from Waterford did a sweep of the bay on Wednesday afternoon.
The search, which is being co-ordinated by the Irish Coast Guard’s Marine Rescue Sub Centre in Valentia in support of the Garda, has involved RNLI vessels from Galway and the Aran islands, Irish Coast Guard units, Civil Defence, local fishing vessels, members of Galway Sub Aqua Club, Cumann Seoltóireachta an Spidéil and Galway Bay Sailing Club, along with kayakers and stand up paddleboarders.
Hundreds of people have also taken part in shore searches from An Spidéal to Barna and eastwards towards Oranmore.
The circumstances surrounding the double tragedy are still unclear, with one theory being that Ms Ní Fhatharta may have tried to assist Mr Duhan when he got into difficulty.
Superintendent Paudie O’Shea of Galway Garda Station told RTÉ News that it was possible that both of the swimmers had become disorientated in the fog "which was lifting and dropping within seconds".
He said there had been huge and overwhelming support from the local community since the search was initiated on Tuesday.