The Western Harbour Tunnel is being delivered in two stages. The northern section of the tunnel, Stage 2, will be delivered by Acciona Construction Australia. This stage of the Western Harbour Tunnel sees early work construction expected to start in 2023. Stage 2 includes connections from Stage 1 at Cove Street, Birchgrove, to the Warringah Freeway near North Sydney, and complete tunnel fit-out.
Transport has determined the TBM methodology to be the best overall solution to deliver Stage 2 tunnelling beneath Sydney Harbour. Our specialised TBM machines will each tunnel for about 1.5km from Birchgrove to Waverton including under the Sydney Harbour seabed, connecting the northern and southern ends of the project.
Subject to detailed design, major work for Western Harbour Tunnel stage 2 is expected to start in in late 2023 and will continue for approximately 5 years.
Consistent with complex major infrastructure projects progressing through an environmental planning and assessment process, the design and construction approach presented in the environmental impact statement was at planning stage and indicative only. Further refinement as part of detailed design is now underway and we are working to develop the design and construction methodologies. This includes tunnel alignment, depth and supporting infrastructure.
The final detailed design is available for Stage 1, the southern end of the tunnel until Cove Street, Birchgrove. Read more about Stage 1 Tunnelling.
Click on any of the links below to access further information about Western Harbour Tunnel Stage 2 tunnelling.
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Western Harbour Tunnel