The Tunnel & Station Excavation (TSE) project is the second stage of the Sydney Metro network that connects stage 1 at Chatswood to the existing heavy rail at Sydenham.

The connection consists of twin 15.5km TBM tunnels that cross beneath Sydney Harbour and includes the complex excavation of underground caverns to facilitate new stations at Chatswood, Crows Nest, Victoria Cross, Barangaroo, Martin Place and Pitt Street (Gadigal) with an open cut station box excavation at Waterloo.

Sydney Metro Northwest is the first stage of Sydney Metro, which included 15 km of twin TBM tunnels connecting the new viaduct rail at Bella Vista and the existing Sydney Trains network at Epping.

The works also included hard rock tunnelling, excavation, and cavern construction of new stations at Bella Vista, Norwest Business Park, Hills Showground, Castle Hill, and Cherrybrook, along with two service shafts.

The West Gate Tunnel Project, which commenced construction in 2020, is a major infrastructure initiative designed to improve Melbourne’s road network by easing congestion and enhancing connectivity. The project features a 6.5-kilometer toll road, including 2.8 kilometers of twin tunnels running beneath the Yarra River. These tunnels will provide an alternative to the heavily congested West Gate Bridge, reducing reliance on the existing structure and offering a more efficient route for commuters and freight transport.

In addition to the tunnels, the project includes widening the West Gate Freeway, constructing new bridges, and creating improved access to key industrial and commercial hubs. A key objective is to improve freight efficiency, particularly for trucks traveling to and from the Port of Melbourne, by reducing travel times and minimising bottlenecks. The upgraded road network is expected to enhance overall road safety, support economic growth, and provide new cycling and pedestrian paths, contributing to a more sustainable transport system.

With a total project value of $11 billion, the West Gate Tunnel Project is a significant investment in Melbourne’s future transport infrastructure. The construction is being carried out by CPB Contractors and John Holland, with CPB Contractors responsible for the $3.3 billion tunnel section. Once completed, the project is expected to significantly cut travel times, ease congestion on local roads, and improve air quality by reducing traffic-related pollution in residential areas.

The WestConnex Rozelle Interchange consists of a 17 kilometre network of tunnels functioning as a new underground motorway interchange which provides connectivity to the M4-M5 Link Tunnels, the new M8 tunnels and the City West Link.

The interchange also provides an underground bypass of the congested Victoria Road between the Iron Cove Bridge and the Anzac Bridge, and a stub connection to the future Western Harbour Tunnel.

The M8 Motorway, formerly known as The New M5, is a 9-kilometre twin road tunnel stretching from Kingsgrove to St Peters, making it the longest road tunnel in Australia.

The project involved 18,000 workers who collectively spent 21 million hours on the job.

The M8 includes a four-level interchange at St Peters featuring 10 bridges, two of which span the Alexandra Canal.

The M4 East Motorway, a significant part of Sydney’s WestConnex project, is a 7-kilometre roadway including a 5.5-kilometre tunnel. This project was completed in 2019.

It links North Strathfield to Haberfield, enhancing transport networks by providing three lanes in each direction.

The motorway’s objectives include improving traffic flow, facilitating urban revitalisation along Parramatta Road, and better integrating Sydney’s west and south-west with the city, airport, and port.