Tunnel boring machines Joan and Millie complete their work on the Metro Tunnel
In a project milestone, 2 of the 4 tunnel boring machines (TBMs) digging the Metro Tunnel have reached their final destination in Melbourne’s CBD.
TBM Millie arrived at Town Hall Station, 25 metres beneath Swanston Street, after tunnelling under the Yarra River from the east. TBM Joan arrived soon after, coming from the State Library Station site in the west.
The other two TBMs will complete their final sections of the Metro Tunnel's twin 9km tunnels in coming weeks. This significant milestone will mark the completion of all TBM digging works for the project.
After all the TBMs have arrived at Town Hall Station they will be dismantled and removed from the site. Roadheaders will then continue digging the rail platform tunnels within Town Hall Station.
You can stay up to date with the Metro Tunnel Project’s TBM tunnelling progress using our TBM Tracker.