This includes a 10.77 km tunnel and a 10 km elevated section, linking at least 25 localities across the city and suburbs.
https://swarajyamag.com/infrastructure/chennai-metro-phase-ii-20-km-completed-96-km-to-go-delays-persist
CMRL
Three-and-a-half years after the commencement of construction on the Chennai Metro Rail's Phase-II project, 20 kilometres of the network have now been completed
https://swarajyamag.com/infrastructure/chennai-metro-phase-ii-20-km-completed-96-km-to-go-delays-persist
Chennai Metro Phase II: 20 Km Completed, 96 Km To Go, Delays Persist
swarajyamag.comThree-and-a-half years after the commencement of construction on the Chennai Metro Rail's Phase-II project, 20 kilometres of the network have now been completed