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Construction Underway for India’s First Undersea Tunnel in Mumbai-Ahmedabad Bullet Train Project  

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MUMBAI (Metro Rail News): Afcons infrastructure has already begun with the piling work for shaft-2 at Mumbai’s Vikhroli to facilitate the construction of a 21 Km-long Tunnel from BKC station to Silphata with an approximate depth of 25-65 meters. 

Four shafts

It is one among the four shafts to be built for the entire 21 km long underground stretch of the Mumbai-Ahmedabad Bullet Train Project. The Shaft-2, being prepared, will be used to launch 2 TBMs—one towards the BKC station’s east end and another towards Sawli, Navi Mumbai. 

The remaining Shaft-1 and Shaft-3 will be built at BKC station’s east end and Sawli, Navi Mumbai, while the 4th Inclined shaft will be constructed at Ghansoli, facilitating NATM tunnelling works. 

MAHSR Undersea Rail Tunnel
Shaft Depth (in meters) 
Shaft 01 (BKC) 36 
Shaft 02 (Vikhroli) 56 
Shaft 03 (Sawli, Navi Mumbai) 39 
Inclined Shaft (Ghansoli)  42 

The tunnels will be used to deploy and retrieve 3 Mega TBMs with an approximate diameter of 13.1 meters. 

Scope of Work

Shaft-02 is located on 3.95 hectares of land in Vikhroli. Of the total stretch, 2 hectares of the land will be used to construct a traction substation & distribution substation, while the rest will be employed for an approach road, segment stacking yard, shaft, etc. 

Package C-02 

Package C-02 is a 21 Km-long underground stretch in the Mumbai-Ahmedabad Bullet train Project awarded to Afcons Infrastructure at an estimated cost of Rs 6397.27 Crore with a 5.17-year deadline. 

Mumbai-Ahmedabad Bullet Train project 

The MAHSR project is being built between Ahmedabad & Mumbai as a High-Speed Rail Project employing Japan’s Shinkansen Technology at an estimated cost of Rs 1.10 lakh Crores. Services for the project are expected to begin by 2026. 

New Possibilities 

The undersea tunnel construction, a pivotal project component, is set to significantly reduce travel time, enhance regional connectivity, and stimulate economic growth. The seamless connectivity offered by high-speed rail is anticipated to open new avenues for trade, commerce, and tourism, fostering a more integrated and dynamic socio-economic landscape between the two major cities. 

Better Paradigms 

The construction of the undersea tunnel represents a significant stride in modern infrastructure, heralding a future where the amalgamation of speed, efficiency, and connectivity will redefine the travel experience for generations to come.


Discover the endless possibilities of our city’s Metro at InnoMetro, our flagship Expo and Conference. Be an active participant in shaping its future towards a more sustainable tomorrow. Stay informed and join us to take a step towards a brighter future.

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