On 22 July 2020, a Boeing 777F main deck cargo fire warning was annunciated as the aircraft was preparing for departure from Shanghai. Fire Service attendance was requested and a MAYDAY then declared to expedite this. All crew evacuated as the main deck cargo main door was being opened. Smoke appeared immediately and flames followed. The fire took almost three hours to extinguish and resulted in major damage. The Investigation concluded that the fire had resulted from spontaneous ignition of a shipment of chlorine disinfection tablets loaded as undeclared dangerous goods due a combination of high ambient humidity and temperature.