On 8 March, 2014, 227 passengers and a dozen crew members boarded a Malaysia Airlines Boeing 777 at Kuala Lumpur airport. Their routine overnight departure to Beijing was known as flight MH370.

That code has come to represent the biggest mystery in aviation history. The relatives of the victims have endured five agonising years of not knowing what happened to their loved ones.

Air traffic controllers lost contact with the jet while it was over the South China Sea. Who was at the controls when the jet veered off course, flew over the South East Asia peninsula then south across the Indian Ocean? Did someone deliberately crash the Boeing into the sea, or did it simply run out of fuel?