Tunnelling under the Yarra River animation

The Metro Tunnel will be built under the Yarra River using Tunnel Boring Machines (TBMs).

TBMs have specialised cutting heads designed to grind through soil and rock.

While the front of the machine is excavating the tunnel, another part of the machine will install the tunnel lining.

Once complete, the new tunnels will allow more trains, more often to run through the CBD and across the wider network.