Mumbai Metro’s TBM Tansa-2 Records Breakthrough at Mumbai Central

Tunnel Boring Machine 1239 operated by Doğuş-Soma JV on Tuesday afternoon arrived at Mumbai Central Station on Mumbai Metro’s upcoming 33.5 km Line-3 (Aqua Line).

Nicknamed Tansa 2, this was TBM 1239’s 3nd (and final) breakthrough, and Doğuş-Soma JV’s 5th of 6 breakthroughs planned for package UGC-03 (Worli – Mumbai Central)’s tunnels. Overall, this was Line-3’s 41st of 42 planned TBM breakthroughs.

Photo via MMRC

This Ø6.65m Robbins slurry machine had previously achieved a breakthrough at Mahalaxmi Station in July 2021. It was then was recommissioned in October 2021 for its final assignment to build the 832m down-line tunnel towards Mumbai Central Station.

Route of Aqua Line’s Package UGC-03 (Mumbai Central – Worli) – view Mumbai Metro information & map
Photo via John Simm at Robbins

A video posted by MMRC can be viewed here.

With this development, tunneling for Line-3’s down-line is complete – all the way from Colaba in the south to Sariput Nagar Ramp, near Aarey Colony Station, in the north.

Line-3 now just has 1TBM working from an all time high of 17. A total of 41 breakthroughs have been recorded so far with just 1 more pending – again on Package UGC-03. I’m trying to ascertain Tansa-1’s status and will update this section when I hear something.

Here’s a table displaying UGC-03’s tunneling plan and status of each tunnel (best viewed on a desktop device).

1UpScience MuseumWorli2072mCompleted Jan 2020
1DownScience MuseumMahalaxmi1136mCompleted August 2021
1UpMahalaxmiMumbai Central830mOngoing
2DownScience MuseumWorli2057mCompleted March 2020
2UpScience MuseumMahalaxmi1118mCompleted July 2021
2DownMahalaxmiMumbai Central832mCompleted June 2022 (this post!)

For more updates, check out the Mumbai section or my Home Page! Sign up for free instant email notifications on new posts over here. Like this post? See how you can get early-access to updates and support the site over here.


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Global traveler who prefers mass rapid transit

7 Responses to "Mumbai Metro’s TBM Tansa-2 Records Breakthrough at Mumbai Central"

  1. Nishant Patel says:

    How much up line tbm remains before last and final breakthrough ?

  2. AK says:

    Hope now with fall of the govt Aarey metro depot construction starts n trail runs can begin

    • Kartik says:

      I was also thinking the same thing. Hope all land ssues will be sorted now and also work on bullet train will be fast tracked.

  3. VB says:

    Hi TMRG
    Any update on final breakthrough?
    Which is the fastest commissioned UG metro in India?


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