The contractor said construction is scheduled to start in March 2018 and will be finished in September 2023. Four TBMs will be used to excavate the tunnels ranging in diameters between 3.5m to 6m.
The DTSS is a systems of deep tunnel sewers conveying waste water by gravity to centralised water treatment plants, where the waste water is cleaned. The whole DTSS project is divided into two phases. Phase one was completed in 2008, where Zublin successfully constructed one section of the project. Phase two will be completed in 2025. Upon completion, Singapore will have an additional conveyance system that is made up of 60km of link sewers and 40km of deep tunnels.
