We've delivered over 160 km of tunnels, outfalls, underground stations, hydropower caverns, and underpasses; moving more than five million tonnes of earth and rock in the process.
Our creative construction approach has seen us successfully pioneer new and innovative technologies, and we are renowned for our capacity to provide fully integrated engineering and construction solutions.
Our tunnelling and underground expertise encompasses every size, technology and technique, including HDD, Direct Pipe®, micro-tunnelling and pipe jacking, sequential drill and blast, road header, New Austrian Tunnelling Method (NATM) / mechanical excavation, and the full range of tunnel boring (TBM) techniques.
Our geographic reach and multidisciplinary capability have seen the successful delivery of transport, water/wastewater, power/energy, underpass, utility and mine-related tunnels and underground structures.
Throughout the decades, creativity and innovation have been hallmarks of our approach, including:
- Construction of the first segmentally lined shield tunnel in Singapore in 1975
- Being at the forefront of introducing pipe jacking in Australia, New Zealand & Asia in the late 1970s
- Constructing the first NATM tunnel in Australia in the 1980s
- Construction of complex pedestrian underpass tunnels in soft ground commencing in Singapore in the early 1980s
- Creating an unsurpassed world record in open TBM (size and type class) production rates for the Blue Mountains Sewage Transfer Scheme during the 1990s
- Delivering multiple award-winning hydropower projects and desalination plants during the 2000s
- Delivery of the southern hemisphere’s current largest diameter TBM-driven tunnel in 2017
- Setting a new world record (surpassing the previous distance by 500m) for Direct Pipe® technology in 2018, and then again in 2020 (2021m single drive);
- Nine successful underwater marine TBM recoveries – four with Direct Pipe®
- Delivering 10 out of the 13 outfalls constructed in New Zealand over the last 15 years.
- Completing the longest large diameter single pipe jack drive through continuous hard rock conditions worldwide in 2020 (1273m x 3m OD)
