Mill Creek Drainage Tunnel TBM unveiled
The 11.6 m Robbins Main Beam TBM is the largest hard rock TBM ever to be used in the US
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A ceremony was held in December 2019 to mark the impending launch of the TBM -
The machine will change size partway through the bore, to a more compact 9.9m -
The 8km Mill Creek Drainage Relief tunnel will provide 100-year flood... -
The 11.6 m Robbins Main Beam TBM is the largest hard rock TBM ever to be used...
