Namma Metro Pink Line Tunnel Project: Nearing Completion

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Image For Representational Purpose Only

BENGALURU (Metro Rail News): The Namma Metro Pink Line tunnel project, spanning from Kalena Agrahara to Nagavara, is reaching its final stages and is expected to be concluded by August this year. This vital transportation endeavour has progressed through three drilling phases, with two phases already completed and the third phase currently underway, boasting a remarkable 94% completion rate.

Tunnel Drilling Progress

In the ongoing third phase, the Tunga and Bhadra Tunnel Boring Machines (TBMs) are drilling a 935-meter tunnel from KG Halli to Nagavara. On February 2, the Tunga TBM initiated southward drilling, whereas the Bhadra TBM started northward drilling on April 2. Forecasts indicate the completion of these TBMs by July 31 and August 31, respectively.

The initial segment of the tunnel project, spanning from Shadimahal to Venkateswarapuram (1066.80 m), and the subsequent phase, extending from Venkateswarapuram to KG Halli (1185.80 m), have both been completed, according to sources.

While tunnelling nears its conclusion, track installation, civil construction, station building, and track alignment efforts remain in progress.

Project Scope and Timeline

The Pink Line Phase-II project encompasses 18 stations and will span 21.26 km from Kalena Agrahara to Nagawara. This extensive line comprises a 7.5-km elevated portion and a 13.76-km underground segment. 

This includes a 12-station tunnel section from Dairy Circle to Nagawara and a 7.50 km elevated line featuring six stops from Kalena Agrahara to Swagat Road.

The underground section involves the construction of twin tunnels spanning 20.992 km. Nearly six of the 18 stations are elevated, while the remaining 12 underground stations are nearing completion.

TBM Operations

The Bangalore Metro Rail Corporation Limited (BMRCL) has deployed nine Tunnel Boring Machines (TBMs) to facilitate tunnel construction. Seven TBMs—Varada, Rudra, Lavi, Vindhya, Avni, and Urja—have successfully completed their tasks.

On February 2, the eighth TBM, Tunga, commenced its final drive from KG Halli to Nagawara, covering a distance of 935 meters. The ninth TBM, Bhadra, began its operations shortly after on April 7, 2024, with the aim of drilling a 939-meter tunnel northward from KG Halli to Nagavara. While initial estimates suggested completion by August, recent reports hint at a more realistic timeline extending to December for the project’s culmination, despite BMRCL’s initial projections.


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