Westgate Tunnel

Westgate tunnel consists of two 15.6m diameter tunnels under Yarraville, between the West Gate Freeway and the Maribyrnong River. The outbound tunnel will be 4 kilometres in length, while the inbound tunnel will be 2.8 kilometres.
Surex has been engaged to oversee the survey control and tunnelling works including maintaining the tunnel guidance systems.


Sydney Metro Stage 1 & 2

North West Rail Tunnel is Stage 1 of Sydney Metro. The project used four TBM’s to excavate and line 30 kilometres of tunnel between Bella Vista and Epping. The project included the excavation and lining of five new Metro stations.

Surex provided all underground surveying services for the excavation and lining of the tunnels. This included project control, including gyro measurements, maintaining guidance systems, as well as segment mould checks for the lining of the tunnel (Industrial Measurement).

Sydey Metro Stage 2 consists of twin 15.5-kilometre tunnels from Chatswood to Marrickville, including a second harbour crossing. This will be excavated with five TBM’s. The project will also see the creation of six new stations, Waterloo, Central Station (new underground platforms), Pitt Street, Martin Place, Barangaroo, Victoria Cross (North Sydney) and Crow's Nest.

Surex has completed the project control and is currently engaged in guiding the TBMs as well as various works at the stations including excavation, concrete lining and monitoring.



WestConnex Stage 1B, is the construction of twin tunnels extending the M4 Motorway in tunnels between Homebush and Haberfield. The tunnels were primarily excavated with Roadheaders using VMT Tunnel Guidance Systems.
Surex undertook the Survey Control for the project as well as maintained tunnel guidance systems. Surex completed the tunnel excavation and support.  The drainage and pavement works were also undertaken in the tunnel as well as services ‘fit-out’.

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NorthConnex is a nine-kilometre tunnel motorway, linking the M1 Pacific Motorway at Wahroonga to the Hills M2 Motorway at West Pennant Hills. When complete the project will offer the long-term capability of three lane travel in both directions.
Surex has a major role in support of tunnel works at NorthConnex completing all tunnel control, including Gyro surveys, as well as assist in tunnel excavation and maintaining tunnel guidance systems and support.


Bullimba Creek Sewer Stage 1 & 2

Bulimba Creek Sewer Upgrade Stage 2 has involved installing 4.25km of new sewer main, from Mansfield to Carindale. This included curved tunnel drives over 800m.

Bulimba Creek Stage 1 consisted of over 4.5 kilometres of sewer upgrade between Wishart and MacGregor for Queensland Urban Utilities.

Both projects used trenchless technology (pipe jacking) with both laser guidance and VMT SLS guidance systems used.

Surex was engaged for the project, with tasks including survey control, shaft works and monitoring. Surex also completed all tunnel related surveys.

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Other Projects

  • North-West Rail Tunnel - Sydney, NSW

  • Epping Main Sewer Project - Epping, VIC

  • Kenmore & Jindalee Cross-river Water and Sewer Pipeline - Brisbane, QLD

  • Woolloongabba Sewer Upgrade - Brisbane, QLD

  • Amaroo Main Sewer Replacement - Craigieburn, VIC

  • Moreton Bay Rail Link - QLD

  • Wynyard Walk Pedestrian Tunnel - Sydney, NSW

  • Narrows Marine Crossing Tunnel Project - Yarwun, QLD

  • Legacy Way Project - Brisbane, QLD

  • Wheatstone Project Micro-Tunnel Construction – Onslow, WA

  • Perth City Link Rail Alliance - Perth, WA

  • Airport Link Northern Busway Project - Brisbane, QLD

  • Ok Tedi Mine Drainage - Papua New Guinea

  • Wonthaggi Desalination Plant - VIC

  • Top Ryde Shopping Centre Development - Sydney, NSW

  • Northern Sewer Project - Melbourne, VIC

  • Sugarloaf Pipeline Alliance - VIC

  • Melbourne Main Sewer Replacement - Melbourne, VIC

  • Southern Regional Water Pipeline - Brisbane & Gold Coast, QLD

  • North South Bypass Tunnel - Brisbane, QLD

  • Kowloon Southern Link Project - Hong Kong

  • Gold Coast Desalination Plant - Coolangatta, QLD

  • Eastlink Project Mitcham Region - Melbourne, VIC

  • Lane Cove Tunnel Project - Sydney, NSW