The Sydney Western Harbour Tunnel project has made significant progress - two tunnel boring machines (TBMs) named "Barangaroo" and "Patyegarang" have been installed and commissioned, and excavation work is about to begin. These two TBMs are the largest scale tunnel boring equipment put into use in the southern hemisphere so far, marking the core construction stage of this major infrastructure project.

According to the engineering plan, these two giant TBMs will operate simultaneously, excavating two parallel tunnels at a depth of 50 meters below sea level. This 1.5-kilometer-long twin tunnel is a key control project for the entire Western Harbour Tunnel project. It will connect the Warringah Expressway with the Rozelle Overpass, forming the most important section of the 6.5-kilometer complete passage.

The project is expected to be fully completed in 2028, forming a two-way six lane traffic artery. According to traffic model predictions, the opening of the new tunnel will significantly optimize the overall traffic pattern of Sydney: the traffic flow of the West Harbour diversion is expected to decrease by 35%, the existing harbor tunnel traffic will decrease by 20%, and the traffic pressure of the Sydney Harbour Bridge, which is a city landmark, is also expected to ease by 17%. Keywords: foreign construction news, international news

This project not only represents a breakthrough in upgrading Sydney's transportation infrastructure, but also showcases the outstanding achievements of modern tunnel engineering technology. Two TBMs named after outstanding Australian Indigenous figures and historical place names symbolize the perfect integration of engineering construction and cultural heritage, which will create a more efficient and sustainable transportation future for Sydney.Editor/Cheng Liting