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.

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.

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).

TBM	Line	From	To	Distance	Status
1	Up	Science Museum	Worli	2072m	Completed Jan 2020
1	Down	Science Museum	Mahalaxmi	1136m	Completed August 2021
1	Up	Mahalaxmi	Mumbai Central	830m	Ongoing
2	Down	Science Museum	Worli	2057m	Completed March 2020
2	Up	Science Museum	Mahalaxmi	1118m	Completed July 2021
2	Down	Mahalaxmi	Mumbai Central	832m	Completed June 2022 (this post!)

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– TMRG