Air Accident investigators are appealing to members of the public who may have video footage of a rescue at Hook Head in Co Wexford to come forward.
On Sunday, two teenagers were winched to safety by the rescue helicopter after they were swept out to sea by a freak wave.
However one of them, a 15-year-old girl, is understood to have accidentally slipped back into the sea while being rescued.
She is still in a critical condition at Waterford University Hospital.
The Air Accident Investigation Unit is appealing to anyone with any footage of the incident to contact .
The investigation is ongoing.