Tunnel boring is now complete on the two twin tunnels that will create a much-needed alternative to the congested West Gate Bridge.

The West Gate Tunnel Project marked a major milestone with Tunnel Boring Machine (TBM) Bella breaking through in South Kingsville, completing a 4km journey from the west side of the Maribyrnong River under Yarraville, to just east of Millers Road near the West Gate Freeway.

Over the past fifteen months, TBM Bella has operated 24/7, excavating over 700,000 cubic metres of rock and soil while installing more than 15,340 individual concrete segments to create the tunnel walls.

The significant milestone comes just two months after TBM Vida completed her journey, marking the largest tunnel breakthrough to occur in the southern hemisphere.

TBMs Bella and Vida have been steadily digging their way under Yarraville, 24/7, creating the two twin tunnels that will create an alternative to the West Gate Bridge.