Sydney Metro TBM breaks cover

Sydney Metro Northwest TBMs Maria and Isabelle project passed through a shaft with the top of their cutter heads above ground.

AUSTRALIA: Tunnel boring machines typically arrive ‘face first’ at a breakthrough sites, but TBMs Maria and Isabelle which are being used on the Sydney Metro Northwest project passed through a future ventilation and emergency access shaft at Cheltenham with the top 3 m of their cutter heads above ground.

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