2017 Irish Coast Guard Rescue 116 crash

In the early hours of 14 March 2017, a Sikorsky S-92 helicopter operated by CHC Helicopter under contract to the Irish Coast Guard (call sign Rescue 116) crashed into Blackrock, an offshore lighthouse, while supporting a rescue operation off County Mayo, on Ireland's west coast. All four crew members on board, Captain Dara Fitzpatrick, Chief Pilot Mark Duffy, winch operator Paul Ormsby, and winch man Ciarán Smith were killed.

Source: Wikipedia — 2017 Irish Coast Guard Rescue 116 crash (CC BY-SA 4.0)