Sydney Metro’s tunnel building contractor John Holland CPB Ghella has handed over the Chatswood dive structure to the line-wide contractors.
Line-wide contractors, Systems Connect will now take over to build the remainder of the dive ramp, fit out the services building and install the metro tracks and related infrastructure to turn the tunnels into an operating railway.
The dive structure ramp will connect the Metro North West Line to the new metro railway tunnels at Chatswood.
A large facility on top of the dive structure will be home to the mechanical, safety and electrical equipment used to run services in the metro tunnels.
The Chatswood and Artarmon stations on Sydney Trains T1 North Shore Line were realigned to make room for the new metro tracks.
At 25 metres deep, 250 metres long and 32 metres wide, 143,000 tonnes of crushed rock was excavated to to create the structure.