Tunneling operations have begun in Madhavaram and Greenways Road, marking the initiation of the construction of twin tunnels in key urban localities from Chetpet to Nungambakkam. A tunnel boring machine (TBM) has been transported to the Chetpet metro station site near Chetpet Lake and is scheduled to be lowered into the shaft in the coming days. This TBM will be responsible for constructing one of the twin tunnels beneath the Sterling Road junction, covering an approximate distance of 850m. This particular stretch is part of the 45.8km corridor-3, extending from Madhavaram Milk Colony to Siruseri Sipcot.
According to L Girirajan, spokesperson for CMRL (Chennai Metro Rail Limited), phase-2 of the project, which spans 118.1km, is expected to be completed in a phased manner before 2028. Excavation work for the shaft at the Chetpet metro station site has been successfully completed, and a base slab has been constructed. The mobilization of the TBM in sections has also commenced. Once all the parts of the machine have arrived, they will be assembled and subsequently lowered into the shaft. This process is expected to be completed by mid-month.
The tunnels will be constructed at a depth of 22m in Chetpet and will gradually reduce to 15m as they progress towards the Sterling Road junction. Additionally, the small section between Chetpet metro station and Sterling Road junction metro station falls under the contract awarded for building tunnels from Kellys to Taramani, covering a distance of 12km on corridor-3. Earlier, tunneling operations had already begun at the Greenways Road metro station site near the Adyar river, which is also part of the Kellys to Taramani stretch.
Chetpet metro station will serve as an interchange, connecting with the Chetpet suburban station. Corridor-3, which traverses the eastern areas of the city, links suburban regions such as Madhavaram Milk Colony and the IT corridor on OMR with core city localities including Chetpet, Nungambakkam, Mylapore, and Adyar.