Tunnel boring machine (TBM) Mabel has broken through a wall of rock at the site of the future Crows Nest Station after tunneling three kilometres from Chatswood.
Tunnelling for the Sydney Metro project is now nearly 50 per cent complete.
Since launching in February this year Mabel has excavated about 290,000 tonnes of sandstone and shale.
The machine will now spend a few weeks undergoing maintenance before being re-launched at Crows Nest.
From there, Mabel will tunnel towards the next future station at North Sydney.
Along with TBM Wendy, Mabel is building 6.2 kilometres of tunnel which will link to the recently opened North West Metro at Chatswood to Blues Point.
TBM Mabel is named after Mabel Newill, a matron at Royal Prince Alfred Hospital, who introduced sanitisation techniques to help stop the spread of Typhoid in Sydney in the early 1900’s.
The North West Metro opened in June this year with the remaining City and Southwest lines due to open in 2024.