The shed will attempt to keep noise and dust at a minimum for nearby residents and businesses while 1.5 million cubic metres of rock and soil is excavated.
The first mega tunnel boring machine has broken through at Waterloo, after tunnelling 3.1 kilometres from Marrickville.
Recruitment is underway for six trainee drivers to operate the tunnel boring machines that will dig the Metro Tunnel.
Melbourne is set to receive the first of two tunnel boring machines (TBM), which will begin work on the West Gate Tunnel by early 2019.
Sydney Metro’s second tunnel boring machine (TBM) has started work to help deliver 31 kilometres of tunnels between Marrickville and Chatswood.