Three crewmembers have died after an accident aboard a rescue vessel on the North Sea, the Associated Press reports. The men were working aboard the Viking Islay—a 53-meter (174-foot) rescue vessel—when the accident occurred, Vroon Offshore Services Ltd. said in a statement. The men were airlifted by the Royal Air Force to the Hull Royal Infirmary in northeast England, where they were pronounced dead, an official at the hospital said. The Viking Islay, which was supporting operations at a rig in BP PLC''s Amethyst Field in the North Sea, has now returned to port where Britain''s Marine Accident Investigation Branch will examine the deaths, Vroon Offshore''s statement said. Vroon Offshore, part of the Vroon Group BV, provides of emergency response services to the offshore oil and gas industry.