Western Harbour Tunnel (WHT) will see a new motorway built underneath Sydney Harbour to connect North Sydney to Rozelle, bypassing the CBD.

The project is being delivered in two stages. Stage 2 includes connections from Stage 1 at Cove Street, Birchgrove, to the Warringah Freeway near North Sydney, tunnelling under Sydney Harbour, and the complete tunnel fit-out.

Tunnelling on WHT – Stage 2 started in November 2023 from the Cammeray temporary construction site and is slated for completion by 2025.

BG&E Scope

BG&E provided structural, civil, and geotechnical engineering services for WHT – Stage 2. Specifically, our team designed the Cammeray Ventilation Building, the associated ventilation shaft, and several alternations of foundations for mechanical and electrical equipment at Rozelle Interchange.

On completion, the project’s twin, three- lane tunnels are expected to reduce traffic on the Western Distributor by 35%, the Harbour Tunnel by 20%, and the Harbour Bridge by 17%.