It's hoped today will be the day divers will gain access to Rescue 116.
The helicopter has been sitting on the ocean floor 40 metres below sea level for over a week.
Three members of the Coast Guard team are still missing.
It is hoped that Captain Mark Duffy, Winch Operator Paul Ormsby and Winchman Ciaran Smith may still be in the wreckage.
The weather that had been hampering the search effort improved overnight and Manager of the Irish Coast Guard Declan Geoghan is hopeful they'll be able to bring the effort to a close soon.
He said: "We've a fair idea of the wreckage on the sea bed in relation to position location. Once we get that area clear around the wreckage with the ROV because safety of the divers will be paramount, we're looking at putting the dive unit in and then getting closer into the wreckage to see if there's any of our colleagues in the wreckage and also looking to retrieve the black box.