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. Subscribe to The Age & SMH: https://subscribe.smh.com.au/ See omnystudio.com/listener for privacy information.