statesman news service
New Delhi, 17 October
By lowering the first Tunnel Boring Machine (TBM) at INA, the Delhi Metro Rail Corporation (DMRC) today started underground tunneling work between INA and South Extension on the Mukundpur to Shiv Vihar corridor.
 The tunneling drive which will cover a distance of 924 metres, will be a part of the Bhikaji Cama Place to Lajpat Nagar underground section of Mukundpur to Shiv Vihar corridor. After its complete assembling at the site, the initial drive of this TBM is expected to start in the first week of November.
 DMRC will place a total of 6,145 precast rings in a total tunneling drive of 4.299 km between Bhikaji Cama Place and Lajpat Nagar. The tunnel will have an internal diameter of 5.8 meters and width of 1.4 meters.
 "This underground stretch between Bhikaji Cama Place and Lajpat Nagar will witness a total of eight TBM launchings. It includes two TBM launches from INA to South Extension, two from South Extension to Lajpat Nagar, two from Sarojini Nagar to INA and two more TBM launches from Bhikaji Cama Place to Sarojini Nagar," said a metro spokesperson.
 The spokesperson further said that it is the second TBM to be lowered on the 58.467 km long Mukundpur to Shiv Vihar corridor. The first TBM on this section is currently operational between Netaji Subhash Place and Shalimar Bagh.
 DMRC is slated to construct 53 km of underground metro lines as part of its Phase III construction work for which about 34 TBMs are expected to be used. A total of 74 tunnels will be constructed in this phase. The tunneling work between Central Secretariat and ITO on the 9.37 km long Central Secretariat to Kashmere Gate corridor has been already completed. In Phase II, 14 TBMs were pressed into service for the construction of 34.89 km of metro lines across the national capital.