It’s the ultimate unthinkable. A father of three drives his children off the road and into a dam. The car sinks. And the father is the only person to get out alive. All three children drown. That father, Victorian man Robert Farquharson, has been in prison for the murder of his children, for much of the past 19 years.  But could he have been wrongly convicted?  On the eve of a lawyer launching a new appeal, a group of scientists, doctors and lawyers are arguing that key parts of the evidence that convicted Robert Farquharson don’t stack up.  Today, investigative reporter Michael Bachelard on following the rope of evidence that convicted the father of three, and the new information that may unravel his prosecution altogether.Subscribe to The Age & SMH: https://subscribe.smh.com.au/See omnystudio.com/listener for privacy information.