Delhi Metro Rail Corporation (DMRC) achieved its first tunnel breakthrough at the Lal Quila Metro station on the Delhi Metro Phase-III project, on 31 July, 2014.

The Lal Quila metro station is on the 9.37 km Central Secretariat – Kashmere Gate corridor, also known as the the Heritage Line of the Delhi Metro.

The Tunnel Boring Machine (TBM) emerged at the Lal Quila metro station site after making a tunnel about 650 mtr long from Jama Masjid on the Down Line. The maximum depth of the tunnel is 14 mtr. The internal diameter of the tunnel is 5.8 mtr. The casting of the segments has been done at the Mundka Casting Yard.

Another TBM is currently operational on the same stretch for the construction of tunnel on the UP Line and is likely to make a breakthrough by October 2014. Tunnelling between Delhi Gate and Jama Masjid is also in progress, while tunnelling work between Mandi house and ITO as well as on ITO and Delhi Gate has been completed.

The 3.23 km long Central Secretariat – Mandi House section, was opened to the public on 26 June, 2014.

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