Two pilots flying a Boeing 777 from London to Seattle were forced to make an emergency landing because their cockpit was starved of air, according to an official report.
All three crew members on the flight deck reported feeling unwell and were forced to wear oxygen masks for the remainder of the flight.
They also had to keep the door between the cockpit and passenger cabin open- contravening flight safety and security rules.
The report, by the Air Accident Investigation Branch (AAIB) concluded that the air supply had been blocked by debris including wire and bubble wrap in a ventilation duct below the cockpit floor.
To read the full report click here.