Naval Service divers will resume their search at the Rescue 116 crash site later today.
The recovery team is trying to raise the wreckage with flotation devices to check for signs of the two crew men who are still missing.
Last night, poor sea conditions off the Mayo coast forced them to suspend the dive.
Meanwhile, Chief Inspector with the Air Accident Investigation Unit Jurgen Whyte says experts in the UK are continuing efforts to download data from the Coast Guard helicopter's black box:
