But what remains a sobering fact is the captain practised almost this very flight a few weeks earlier on his home simulator program and that was referenced in the final report from the Australian Transport Safety Bureau.
Claims that there were no signs of suicide tendencies are dismissed by experts in the field.
In an article in Harvard Health Dr. Michael Miller, assistant professor of psychiatry at Harvard Medical School said “many people who commit suicide do so without letting on they are thinking about it or planning it.”
But could it have been someone who stowed away beneath the floor in the plane’s equipment bay which houses most of the plane’s computers.
Finding the actual cause of the crash may prove very difficult as the cockpit voice recorder is on a two-hour loop and the part the investigators will want to hear, when the plane first turned, would have been wiped.
The flight data recorder however will reveal details of every system.
Searches will want to see who is in the cockpit – the captain or someone else.