As the line-up of experts continues, we go on a crash course on the inner workings of the Gore sewerage ponds, and we hear yet another opinion on whether Lachie could have made it all the way out there by himself.

You can see an image of a cross section of the pond on our Facebook page and our Instagram page.

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Presented by award-winning investigations editor Melanie Reid. Discover more at Newsroom.co.nz

Sign up to DELVE+ to get early access to new episodes and listen to all four seasons of our award-winning The Boy in the Water podcast, both seasons of Fractured, the explosive Powder Keg and Satanic Panic: Peter Ellis, the Creche Case & Me, all ad-free. Presented by investigations editor Melanie Reid. Discover more at Newsroom.co.nz and search for Melanie Reid Investigates on Facebook and Instagram.

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S3 | The Boy in the Water Ep 11: The Psychologist And The Water Guy