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Tunnel-boring machine facts
  • Each tunnel-boring machine (TBM) is six metres wide, 150 metres long (about the length of five blue whales) and weighs nearly one million kilograms (equal to approximately 333 elephants).
  • Inside each TBM will be eight to 12 trained staff controling the machines and monitoring the viatls of the operation.
  • The TBMs will advance approximately 18 metres per day.
  • The excavation of both tunnels will generate approximately 200,000 cubic metres of soil that will be moved on a conveyor system out of the tunnels at Great Northern Way. 
  • The tunnels will be approximately 15 metres below ground, to a maximum of 20 metres at Broadway-City Hall Station.
  • Once the machines arrive at Cypress Street, they will be disassembled and removed through an excavation shaft.