Uploaded January 2019 | Updated September 2026, 1 hour ago

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Mollie the mini tunnel boring machine (TBM) has now finished digging the first section of the North Yarra Main Sewer diversion at Yarraville.

Before tunnelling for the West Gate Tunnel Project begins in 2019, we need to divert a 600 metre section of the North Yarra Main Sewer. Diverting a sewer is a massive job that involves excavation, piling, tunnel boring and changes to traffic – and we’re going to build it without interruption to sewerage services during the diversion works.

Learn more: http://westgatetunnelproject.vic.gov.au/disruptions/north-yarra-main-sewer-diversion