Project Details

  • Project Owner: Acciona Construction Australia Pty Ltd
  • Rating Type: V 1.2 Design and As Built
  • Registered Date: December 2022
  • Completion Date: March , 2029
  • Location: NSW
  • IS Project manager: Asim Nizam
  • Stakeholders: Transport for NSW, Aecom - Aurecon Joint Venture, Acciona Construction Australia Pty Ltd


Western Harbour Tunnel is an iconic, regenerative critical piece of infrastructure that will be recognised for its significance in engineering and design over the next 100 years on a global scale. Most importantly it will be recognised, for the positive impact it will have on the community and environment. By incorporating a whole of life approach to sustainability, and utilising the IS Rating framework, ACCIONA will be able to ensure the design, construction and operation of the project will deliver positive outcomes to society and the historic site.

The WHT is a major transport infrastructure project that will make it easier, faster and safer to get around Sydney. By creating a western bypass of the Sydney CBD, the WHT will take pressure off the Sydney Harbour Bridge, Sydney Harbour Tunnel, Anzac Bridge and Western Distributor corridors to improve transport capacity in and around Sydney Harbour. 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.

The tunnel project will be built using two Tunnel Boring Machines (TBMs) to tunnel through clean sandstone under Sydney Harbour, while roadheaders will excavate the clean sandstone on the north side of the Harbour. Using the TBMs will eliminate any dredging activities through the Sydney Harbour seabed, removing risks to the marine environment and biodiversity and the need for construction sites at Yurulbin Point and Berrys Bay, significantly reducing construction impacts for thousands of residents in Birchgrove and Waverton. Once all excavation activities are finished, the roadheaders will be removed from the two northern tunnelling construction sites and the TBMs will be disassembled and removed in pieces. The larger parts of the TBMs that cannot be removed will be buried underground allowing for the mechanical and electrical (M&E) work to fit out the tunnels with lighting, safety features, and jet fans to proceed.

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