Metro Tunnel - Tunnel Boring Machines

Tunnel Boring Machines (TBMs) are large machines that tunnel through ground, progressively installing concrete linings to support the excavated tunnel. Excavated material is transported through the machine to the surface for removal by trucks.
TBMs are typically used in the construction of long underground tunnels. They are tailored for specific ground conditions and are more than 100 metres long and weigh up to 1,000 tonnes.
Metro Tunnel's TBMs will be built and tested overseas, before being disassembled and shipped to Melbourne in segments. When the TBMs arrive, the segments are transported from the Port of Melbourne to the St Kilda Road precinct and North Melbourne, where they are reassembled on site, ready to start tunnelling.
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