The Sligo-based Coast Guard helicopter was involved in an early-morning medical evacuation 180 miles off the Mayo coast when it airlifted a Russian crewman to hospital.
The incident took place in the early hours of Wednesday morning when the Irish Coast Guard received a request from a Russian fishing vessel seeking urgent medical attention for a crewman.
The vessel was located 180 miles northwest of Erris Head, and the operation was coordinated by the Coast Guard Rescue Coordination Centre in Malin Head.
The Sligo-based helicopter Rescue 118 was directed to the scene, but owing to the distance involved, communication support, known as Top Cover, was provided by a second Coast Guard helicopter, the Dublin-based R116. Both helicopters refuelled at Blacksod prior to going to the scene.
Rescue 118 completed the early-morning medical evacuation of a crewman at 4.30am, and he was transferred to Sligo University Hospital where he was admitted shortly before 6am. His condition is unknown.