With TBM Grace now tunnelling and Sandy soon to launch, production of tunnel segments has ramped up over the past month.
On Wednesday 16 August Premier Mark McGowan and Transport Minister Rita Saffioti toured the project's pre-cast facility in Forrestfield.
In the project's biggest milestone to date, the first of two tunnel boring machines has now begun its 8km underground journey from Forrestfield to Bayswater.
On Sunday 30 July Premier Mark McGowan launched TBM Grace to mark the start of tunnelling.
With the first tunnel boring machine launching soon, the project has kicked into full swing.