Mumbai Metro: 50 Per Cent Tunnelling Completed On 56 KM-Long Colaba-Bandra-SEEPZ Corridor’s Underground Line

Mumbai’s first underground metro rail line has seen breakthrough as 28-km (50 per cent) tunnelling of Line 3 has been completed in a period 19 months. The Mumbai Metro 3, or line 3 is a 56-km line on the Colaba-Bandra-SEEPZ corridor.

The breakthrough was revealed by journalist Rajendra B. Aklekar on Twitter. The Mumbai Metro Rail Corporation (MMRC) launched the first tunnel boring machine (TBM)- Krishna-1 at Naya Nagar, Mahim in September 2017.

Since then the MMRC has worked in full steam with the help of 17 TBMs to tunnel the city, and are working towards the next 19 breakthroughs on the 33.5 km long metro-3 alignment.

The first breakthrough on alignment came in September 2018, followed by 12 more breakthroughs achieved at SEEPZ, CSIA T2, Sahar Station, MIDC, Domestic Airport T1, Dadar, Worli, Vidyanagari and Vidhan Bhavan over the next eight months till May 2019.

The longest line of tunnelling completed is the 3.9 km-long stretch between Vidyanagari and the Domestic Airport, and the shortest line is the 562-meter long Sariput Nagar to SEEPZ stretch. Totally, 19,504 segment rings were used to tunnel the completed 28 km stretch.