With the launch of TBM Meg from the Arden site in North Melbourne, all four of the Metro Tunnel’s tunnel boring machines are now digging the projects’ nine-kilometre twin tunnels across Melbourne.

This is a major milestone for the Metro Tunnel project, where work is continuing across all sites in accordance to strict safety measures.

Each of the four TBMs are named after prominent Victorian women – Victoria’s first female Premier Joan Kirner, Australian women’s cricket team Captain Meg Lanning, Victoria’s first female Member of Parliament Lady Millie Peacock, and medical hero Alice Appleford.

TBMs Joan and Meg were the first to launch, in 2019, and completed the 1.2 kilometre stretch of twin tunnels from Arden to the western tunnel entrance in Kensington earlier this year.

Pieces from the 1,000-tonne TBMs were returned to Arden Station by trucks with the rest of the TBMs pulled back through the tunnels and reassembled.

TBM Joan was relaunched in May from Arden towards the site of Parkville Station and TBM Meg, after all essential checks were completed, was relaunched last week.

TBM Millie was launched in April and dug the first tunnel between Anzac Station and the Metro Tunnel’s eastern entrance at South Yarra. TBM Alice was launched in May to begin creating the parallel tunnel.

Project progress

The Metro Tunnel project has made significant progress. At Parkville Station, excavation of the station box Grattan Street is now complete, while at State Library Station 50 steel columns are being installed.

The Metro Tunnel is on track to be completed by 2025 – a year ahead of schedule. It will allow more trains to run to the suburbs and reduce travel times by running the busy Cranbourne, Pakenham and Sunbury lines through a new tunnel under Melbourne’s CBD.

For more information, visit the Metro Tunnel project page.

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