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Mary measures 46 feet high, 430 feet long, and weighs around 4,700 tons. Designed to operate in soft earth, the TBM employs an enormous cutter head that rotates through the earth, designed specifically for the local geology. The machine creates concrete rings for structural support, with crews diligently working 24 hours a day to ensure consistent progress.
Structural Integrity and Safety Measures
While the tunneling progresses, safety remains paramount. The TBM operates under significant pressure to prevent collapses and sinkholes. Furthermore, the project includes a permanent pump station to manage water ingress, ensuring that the tunnel remains free from flooding.