Andrew Jones is piloting the giant tunnel boring machine named Barangaroo under Sydney Harbour. Wolter Peeters The rear part of the boring machine, where concrete segments are brought in on specialised trucks. Wolter Peeters To lower the risk, one boring machine will pass through the paleo channel at a time – the first before Christmas. We’re replicating the external pressures,” said Marsonet, who worked on the Sydney Harbour Tunnel, as well as the Airport Link and WestConnex tunnels. Trucks daily cart about 120 loads of spoil churned out by the boring machines from beneath Birchgrove to sites in western Sydney.