The preferred route was announced and a market sounding process commencedĬoffey and AECOM were engaged to conduct geotechnical investigations along the route, including 235 boreholes.Ī State Significant Infrastructure Application (SSIA) was lodged to identify topics for a future Environmental Impact Statement (EIS) $77 million was committed towards geotechnical investigations The NSW Budget allocated funding to commence planning The project was identified in Infrastructure NSW’s 2014 State Infrastructure Strategy The Northern Tunnelling Works package includes construction of northern tunnelling from Birchgrove, through Sydney Harbour and onto North Sydney, the marine work and all the tunnel fit-out. The Southern Tunnelling Works package includes construction of approximately 1.7 kilometres of twin three-lane tunnels between Rozelle and Birchgrove. The Tunnel will be delivered through two packages. ancillary infrastructure to enable ongoing operation of the tunnel.surface connections to City West Link at Rozelle and to Warringah Freeway, Falcon Street and Berry Street in North Sydney, and.future connection options for Beaches Link and Gore Hill Freeway.tunnel-to-tunnel connection to the M4-M5 Link near Rozelle Interchange.tunnels to be mostly driven, with the crossing of Sydney Harbour between Birchgrove and Waverton being immersed tubes.twin tunnels, each with three lanes and approximately 6.5 kilometres long.Key components of the Western Harbour Tunnel will include: Once complete and via the Beaches Link, there will be a continuous connection from WestConnex at Rozelle to Sydney’s Northern Beaches. The tunnel will connect the WestConnex Rozelle Interchange with the Warringah Freeway in North Sydney. The Western Harbour Tunnel will be the second road tunnel under Sydney Harbour.