Metro 3 (Colaba-Bandra-Seepz) has completed its tunnelling work under Mithi river. A tunnel breakthrough is when the tunnel completes its pre-determined length. The 33.5-km underground Metro-3 (Colaba-Bandra-Seepz) has 32 tunnel breakthroughs in total. The Tunnel-Boring Machine (TBM) Godavari-3 covered a length of 1,500.80m between Bandra-Kurla Complex (BKC) and Dharavi metro stations.
As stated in the Hindustan Times, Project Director S.K. Gupta said that tunnelling under the Mithi was a challenging task as the geology was weak and fractured. Hence, they had to deploy earth-pressure balance TBM and had taken other necessary technical measures and expertise.
Chennai too has a Metro line that runs underwater. Kolkata, on the other hand, is also building a metro line under Hooghly river.
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The Metro 3 line will comprise of 27 stations and is expected to be completed by December 2021. The excavation work has been completed for 13 stations i.e. Cuffe Parade, Vidhan Bhavan, Churchgate, Hutatma Chowk, Chhatrapati Shivaji Maharaj Terminus (CSMT), Science Museum, Siddhivinayak Temple, Maharashtra Industrial Development Corporation (MIDC), Marol Naka, Sahar Road, Chhatrapati Shivaji Maharaj International Airport (CSMIA) Domestic, CSMIA International Airport, and Seepz.
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The MMRDA (Mumbai Metropolitan Region Development Authority) has undertaken work on a new underground Metro line that connects Metro Line 7 with CSIA (Chhatrapati Shivaji International Airport). This will be located between the Western Express Highway, Andheri, and Dahisar (East).
The Metro Line 7A spans a total of 3.1 km out of which 2.1 km will be underground. This will also include a twin-tunnel. The contractors will reportedly use a cut-and-cover method for the construction which will see the roads removed and patched up again when the work is completed
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