On 22 April 2019, a Eurocopter-Kawasaki BK-117C-1 helicopter was being positioned for the aeromedical evacuation the following day of a sick crewman on a fishing vessel when it was unintentionally flown into the sea at night. The three crew members were able to evacuate from the partially submerged aircraft before it sank. The accident was attributed to the single pilot’s loss of situational awareness due to loss of visual depth perception when using Night Vision Goggles. The relevant aircraft operator procedures and the applicable regulatory requirements were both found be inadequate relative to the operational risk which the flight involved.