Mumbai Metro’s TBM Tansa-1 Records Breakthrough at Mahalaxmi

Tunnel Boring Machine 1238 operated by Doğuş-Soma JV on Thursday evening arrived at Mahalaxmi Station on Mumbai Metro’s upcoming 33.5 km Line-3 (Aqua Line).

Nicknamed Tansa-1, this was TBM 1238’s 2nd (and penultimate) breakthrough, and Doğuş-Soma JV’s 4th of 6 breakthoughs planned for package UGC-03 (Worli – Mumbai Central). Overall, this was Line-3’s 40th of 42 planned TBM breakthroughs and tunneling progress now stands at 97% completion.

This Ø6.65m Robbins slurry machine had previously achieved a breakthrough at Worli Station in January 2020 and was then transported back to Science Museum Station through the city’s streets in March.

For its most recent assignment, it was recommissioned in September 2020 for its second drive to build the 1136m down-line tunnel towards Mahalaxmi Station.

Route of Aqua Line’s Package UGC-03 (Mumbai Central – Worli) – view Mumbai Metro information & map
Tansa-2 (Robbins 1239) getting retrieved onto a cradle

Video by MMRC:

Line-3 has just 2 TBMs (Tansa-1 and Tansa-2) working from an all time high of 17. A total of 40 breakthroughs have been recorded so far with 2 more pending – all on Package UGC-03.

Here’s a table displaying UGC-03’s tunneling plan and status of each tunnel (best viewed on a desktop device). Note that TBM 1238 (Tansa-1) and 1239 (Tansa-2) had switched positions (up-line to down-line and down-line to up-line) for their 2nd assignment.

1UpScience MuseumWorli2072mCompleted Jan 2020
1DownScience MuseumMahalaxmi1136mCompleted August 2021 (this post!)
1DownMahalaxmiMumbai Central830mPending Start
2DownScience MuseumWorli2057mCompleted March 2020
2UpScience MuseumMahalaxmi1118mCompleted July 2021
2UpMahalaxmiMumbai Central837mPending Start

From here on, both Tansa-1 and Tansa-2 will now be dragged across Mahalaxmi Station’s platform level and recommissioned towards Mumbai Central for their final 830m and 837m assignments. I’m expecting both to be recommissioned in September. Stay tuned…

For more updates, check out the Mumbai Metro section or my Home Page!


written by

Global traveler who prefers mass rapid transit

3 Responses to "Mumbai Metro’s TBM Tansa-1 Records Breakthrough at Mahalaxmi"

  1. Anirudh Kulkarni says:

    Bro, any update on
    1) Aarey Colony Depot ?
    2) Bengaluru OOR metro?

    • TMRG says:

      1) Unfortunately no movement. What a shame.
      2) Barricading and pre-construction work is underway (test piling, soil investigation etc.)

  2. Rupraj Sengupta says:

    Congratulations you will finish much before the depot work starts,you are going in the right direction following Kolkata model 🤣🤣🤣


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