Tunnel boring machine (TBM) Millie has reached a significant tunnelling milestone, arriving 12 metres below the bed of the Yarra River on the way to the new Town Hall Station closely followed by TBM Alice Boring  a parallel tunnel from the Anzac Station site.

Tunnelling for the Metro Tunnel project is 85% complete:

https://metrotunnel.vic.gov.au/about-the-project/news/tbms-tunnel-under-the-yarra-towards-final-stop