There were two key witnesses in the Robert Farquharson case.

The first was Greg King, an old friend of Farquharson, and the story he told provided police with something they desperately wanted for their case - a motive for murder.

The other witness, Dawn Waite, came forward four years after the crash. She said she had actually seen Robert Farquharson on the night of the crash, as he was sizing up his exit from the road.

But how reliable are they? And how much can we trust our memories?

For exclusive content and additional reporting on the case, available to subscribers of The Age and The Sydney Morning Herald, visit theage.com.au/trialbywater or smh.com.au/trialbywater.  Subscribe now to access the special Good Weekend investigation, which features never-before-seen 3D models recreating key scientific evidence, video, audio and other interviews.

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A day after Robert Farquharson drove his car into the dam with his three sons, the homicide squad took over the investigation. Sceptical of his story and suspecting Farquharson's motive was revenge, they began delving into every aspect of his account.

Had he really coughed and passed out? Or would the evidence show he deliberately steered off the road and into the dam to murder his children?

For exclusive content and additional reporting on the case, available to subscribers of The Age and The Sydney Morning Herald, visit theage.com.au/trialbywater or smh.com.au/trialbywater. Subscribe now to access the special Good Weekend investigation, which features never-before-seen 3D models recreating key scientific evidence, video, audio and other interviews.

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On Father’s Day, 2005, Robert Farquharson crashed his car into a dam. He survived, but his three children who were in the car with him didn’t. At first it seemed like a tragic accident. But quickly, it turned into a murder investigation.

For exclusive content and additional reporting on the case, available to subscribers of The Age and The Sydney Morning Herald, visit theage.com.au/podcast/trialbywater or smh.com.au/podcast/trialbywater. Subscribe now to access the special Good Weekend investigation, which features never-before-seen 3D models recreating key scientific evidence, video, audio and other interviews.

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From The Age and Sydney Morning Herald, Trial by Water is a new investigative podcast series about Robert Farquharson, who has been locked up for decades for an unthinkable crime: murdering his three sons in a dam on Father’s Day, 2005.

Now scientists and lawyers are asking the question: did we get it wrong? And is this man in prison for a crime he didn’t commit?

Episode 1 will arrive on Saturday, June 1.

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