n 8 March 2014, Malaysia Airlines flight MH370 left Kuala Lumpur for Beijing and never landed.
Since then, the most expensive underwater search in history has failed to find it, and authorities are no closer to figuring out why, 40 minutes into what should have been a six hour flight, MH370 diverted and flew towards the southern Indian Ocean with 239 people on board.
Theories abound about why the plane disappeared, and where it can be found. Some have changed, some have been discredited, and new theories have emerged, as search after search has failed to end one of aviation's greatest mysteries.
2014: A northern landing
In the immediate, confused aftermath, an early theory suggested MH370 had been taken, not south into the sea, but north into central Asia.