Bangalore Metro’s TBM Tunga Achieves Breakthrough at K G Halli Station 

The TBM recorded a breakthrough after tunnelling a tunnel of length 1,184.8 meters.

Bangalore Metro’s TBM Tunga Achieves Breakthrough at K G Halli Station
Bangalore Metro’s TBM Tunga Achieves Breakthrough at K G Halli Station

Bangalore (Metro Rail News): TBM Tunga of the Bangalore Metro achieved its second breakthrough on the 21.26 Km Pink Line. 

Tunnelling Assignment 

The TBM has constructed a tunnel of 1,184 meters in length in 401 days. It was commissioned on October 31, 2022, between Venkateshpura and KG Halli. It is the 21st of the 24 tunnels built on the 21.26 Km Pink Line. 

Earlier Assignment 

The TBM was earlier deployed to build a 1,260-meter-long tunnel running between Venkateshpura and Tannery Road. It was first commissioned on July 23, 2021, when it took 13 months for its first assignment. 


Its 1,184 km long path comprises 405 of rock, 40% of soil, and 20% of both. It is the primary reason it could tunnel only 2.99 meters daily. 

Total Tunneling 

Out of 20.991 Km of the tunnelling target, 18.823 meters, nearly 89.70 stands complete. 

Further Development 

With the unfolding of this development, the twin tunnels connecting the South Ramp to Venkatreshpura are further ready for civil works. 

Total TBMs

The BMRCL had deployed 9 TBMs on the Pink line to construct 20991 kms of the tunnel. Out of 9, 7 TBMs have already completed their task, while the TBM 3rd drive of Tunga & 2nd drive of Rudra remains to be completed. 

Update on Stations of Pink Line 

Stations falling between Dairy Cicle & Shivajinagar have achieved 70-90% completion, while those between Cantonment & Tannery Road have achieved  85% completion. Stations like Venkateshpura, KG Halli and Nagavara stand at 65% completion. 

Pink Line, Bangalore Metro 

The 21.26 Km-long Pink line of the Bengaluru metro has a 13.76 Km Underground section & a 7.5 Km elevated section. It has a total of 18 stations, including 12 underground. BMRCL hopes to complete all civil & track-laying works on the Pink Line by the second half of 2024. It is being built at an estimated cost of Rs 11,500 Crore. 

The Pink Line is expected to begin its commercial operations by March 2025. 

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