Major excavation work is almost complete at Chatswood so that tunnelling can start, extending Sydney Metro from the north west into the city.
Two tunnel boring machines will launch from Chatswood and dig twin 6.2 kilometre metro tunnels to the edge of Sydney Harbour, via new metro stations at Crows Nest and Victoria Cross in North Sydney.
Two TBMs have already started tunnelling the 8.1 kilometres of twin metro tunnels from Marrickville to the new Sydney Metro station sites at Waterloo, Central, Pitt Street, Martin Place and Barangaroo, where they will be removed from deep underground.
A fifth specialised TBM will tunnel under Sydney Harbour.
A 350-tonne crane at Chatswood will move TBM parts into place.
The vertical conveyor and acoustic shed are also taking shape.
The vertical conveyor is the only one of its kind on the Sydney Metro City & Southwest project. It will lift the crushed rock from tunnelling up the belt using a bucket system. .
During peak operating periods, the conveyors will move up to 8,000 tonnes of crushed rock a day.
About 128,000 tonnes of excavated material has already been removed from the site.