Afcons Infrastructure Limited achieved another tunnel breakthrough at Tughlakabad Railway Colony station for package DC-07 under the Delhi Metro Phase IV Project on July 29, 2025.
The breakthrough was achieved using mammoth 91 metres long boring machine. The tunnel was constructed at an average depth of 18 metres and about 559 rings were installed with inner diameter of 5.8 metres.
Package DC-07 involves design and construction of underground up and down tunnels by shield tunnel boring machine (TBM) from end of cut and cover tunnel near Sangam Vihar metro station up to existing Sarita Vihar depot, underground ramp and cut and cover tunnels near Sangam Vihar and Tughlakabad metro station and underground metro stations at Maa Anandmayee Marg, Tughlakabad Railway Colony and Tughlakabad including retrieval/launching shafts on Aerocity-Tughlakabad corridor. The package was awarded in January 2022.
Delhi Metro Phase IV Project involves development of 112.4 km long metro rail network comprising six corridors with an investment of Rs 468 billion. The three corridors to be developed on priority basis are Maujpur-Mukundpur (12.31 km), Janakpuri West-RK Ashram (29.26 km) and Aerocity-Tughlakabad (23.62 km). Whereas the other three corridors approved in 2024 by the central government are Inderlok-Indraprastha (12.37 km), Lajpat Nagar-Saket G Block (8.38 km) and Rithala-Narela-Kundli (26.46 km).