Underwater searches are continuing off Blackrock Island in Co Mayo as part of the ongoing investigation into the fatal crash of the Coast Guard Rescue 116 helicopter last March.
Cameras on board the Marine Institute's Holland I Remotely Operated Vehicle (ROV) are being used to examine areas around and close to the crash site.
The ROV is being deployed from the Irish Lights Vessel, Granuaile, which will be stationed in Blacksod Bay until tomorrow.
Investigators are revisiting the area, in an effort to determine if there is any previously undiscovered evidential material around the island.
Small volumes of debris are still being washed ashore but the undersea exploration is aiming to see if there are any further indications as to where the remains of two of the R116 crew members are located.
The latest search off the north Mayo coast has also involved dive volunteers from Donegal, Mayo and Galway.
Over the weekend, investigators surveyed the waters around the Inishkea and Duvillaun islands, to see if any material had been moved following a trawl of waters around Blackrock.