Excavation Completed for Mumbai Metro’s Sahar Crossover Cavern

Endacom’s team on this past Friday celebrated the completion of excavation works for Mumbai Metro Line-3‘s Sahar “Scissor” Crossover Cavern – a facility for the line’s Alstom trains to switch tracks between the up-line and down-line.

This 227m long crossover on the Aqua Line was designed by Geoconsult and is 18m wide at its widest point. The cavern was built using the New Austrian Tunnelling Method (NATM) by a joint venture of experts from Endacom, Bedi Consulting UK and Normet Group as part of a subcontract from J Kumar – CRTG JV whose responsible for building the 4.45 km package UGC-06 (CSIA T1 – Sahar Road – CSIA T2) of the line.

Endacom’s team

I had reached out to Endacom last week for a comment and additional images, and will update this section if and when I hear back. Per Mumbai Metro Rail Corporation (MMRC), which announced the news today, excavation works took 498 days to complete.

Steel fiber reinforced cast concrete final lining works – Photo Copyright: MMRC via Rajendra B Aklekar

As shared earlier – the JV opted for a shotcrete final lining support method, instead of a traditional fiber-reinforced plastic lined cavern. During excavation, the team has dismantled TBM rings built by J Kumar – CRTG’s Terratec TBMs.

Dismantled tunnel rings built earlier by one of J Kumar – CRTG’s Terratec TBMs

More old snaps can be viewed here.

The cavern’s tunnels will now be finished with a waterproofing membrane (like this at Marol Naka) and a steel fiber reinforced cast concrete final lining.

This package (UGC-06) has 1 more tunnel breakthrough pending right now which is expected to take place towards the end of Q1 2021 at CSIA’s Terminal 1 from Sahar Road Station. When that happens, Line-3’s twin tunnels will be ready all the way from Science Museum in South Bombay to Sariput Nagar ramp at the mouth of Aarey Colony where the line’s depot was originally planned.

For more updates, check out the Mumbai section of The Metro Rail Guy!


written by

Global traveler who prefers mass rapid transit

9 Responses to "Excavation Completed for Mumbai Metro’s Sahar Crossover Cavern"

  1. saket says:

    Are there any other crossovers? I am aware of only one near Colaba.. Hopefully quick resolution of depot issue is done by the govt to help in getting this line started…

  2. Clevin Gomes says:

    Where the crossover will built at Cuffe Parade

  3. Shom Raturi says:

    After the Mumbai Highcourt judgement on proposed Kanjurmarg depot what is the fate of Dahisar (e) Goregaun east metro line?

    • Clevin Gomes says:

      Did you mean Red Line (Line7,7A&9). Currently the red line will use the Yellow Line’s Charkop Depot as both lines are physically connected. The Red have a initial plan to have a Depot at Dahisar on the AAI Land, but due to some unknown reasons the matter didn’t materialized. Now MMRDA have a plan to build the Depot at Mira-Bhayander on a 20 Ha Govt. Land.


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