Police had already searched the property and water tank in 2013, but structural issues made it difficult. "It was always something we weren't comfortable with leaving, but we had to wait for the court process to take its course," WA Police Detective Inspector Quentin Flatman said. Wark was found not guilty during his first trial in 2013, but last week a judge sentenced him to 18 years jail for Hayley's manslaughter during a second trial. Fresh evidence during Wark's second trial led investigators back to the location on Tuesday and the water tank and ground underneath it was torn apart in hopes Hayley's remains would be found.