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Sydney Metro Harbour tunnel

Tunnelling

Sydney Metro City & Southwest

Tunnelling finished in March 2020 on the twin tunnels from Chatswood to Sydenham, including under Sydney Harbour and through the Sydney CBD. 

The tunnel boring machines (TBM) tracker used to follow the historic dig by the five tunnel boring machines on the City & Southwest project can be found on this map

Sydney Metro West

The tender process has started for tunnelling between Westmead and The Bays precinct with the first tunnel boring machine expected to be in the ground before the end of 2022.

About our tunnels

Our tunnel boring machines

Five TBMs were used to deliver the tunnels between Chatswood and Sydenham for Sydney Metro City & Southwest. This included a specialised TBM for the section under Sydney Harbour because of the ground and rock conditions found at the bottom of the harbour.

Four mega tunnel boring machines built the twin tunnels on Metro North West Line. This was the first time in Australian history four TBMs were used on the one transport infrastructure project.

Naming the TBMs

On major tunnelling projects around the world, underground workers look to Saint Barbara for protection. Because of this, machines that work underground are traditionally given female names.

Chatswood TBM Wendy

e-book: Building Australia's longest railway tunnels

Sydney Metro City & Southwest TBMs

Sydney Metro Northwest TBMs

Tunnel safety

Safety of customers is the number one priority. Tunnel safety measures include cross passages linking the twin tunnels and constant camera coverage.

Construction worker inside the tunnels.

Tunnel safety

Cross passages link the twin tunnels every 240 metres.

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