Sydney Metro's tunnel boring machine Kathleen has launched 30 metres below ground, deep underneath Sydney Harbour.
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Sydney Metro tunnelling breakthrough
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.
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Sydney Metro TBM ready to launch
The Sydney Metro project's fifth tunnel boring machine has passed final inspections.
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