Mumbai Metro’s TBM Surya-2 Records Breakthrough at CSMT

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Moments ago, Tunnel Boring Machine Surya-2 operated by Larsen & Toubro – Shanghai Tunnel Engineering Company JV arrived at Chhatrapati Shivaji Maharaj Terminus on Mumbai Metro’s 33.5 km Line-3 (Aqua Line).

This was Surya-2’s 4th (and final) breakthrough, and L&T-STEC JV’s 7th (and penultimate) breakthough for the 4.25 km Package UGC-01’s tunnels between Cuffe Parade and CSMT. Overall, this was Line-3’s 37th of 42 planned TBM breakthroughs.

This Robbins Crossover XRE TBM had recorded a breakthrough in October 2020 at the southern-end of Hutatma Chowk Station’s 233 meter NATM-mined tunnel and then tunneled right through it to get towards its northern-end. It was then re-commissioned for its 4th assignment on January 2, 2021 to build the 556 meter long down-line tunnel towards CSMT.

Package UGC-01: Cuffe Parade – CST – view Mumbai Metro Aqua Line route map & info
Completion of core cutting works to receive Surya-2 on April 21
Boom!

With this development, here’s the status of package UGC-01 between Cuffe Parade and CST / CSMT stations where 1 final breakthrough is pending, also at CST. The team is aiming to wrap that up in May-end.

This table is best viewed on a desktop device –

TBM Line From To Distance Status
1 Up Cuffe Parade Vidhan Bhavan 1128m Completed
1 Up Vidhan Bhavan Churchgate 498m Completed
1 Up Churchgate Hutatma Chowk 649m Completed
1 Up Hutatma Chowk CST 551m In Progress
2 Down Cuffe Parade Vidhan Bhavan 1254m Completed
2 Down Vidhan Bhavan Churchgate 481m Completed
2 Down Churchgate Hutatma Chowk 653m Completed
2 Down Hutatma Chowk CST 556m Completed (this post!)

Line-3’s depot issues have still not been resolved with the Bombay High Court yet to decide whether the saltpan land identified in Kanjurmarg – for housing a mega depot catering to different lines – belongs to the state or Centre.

That said, Line-3 now has just 3 TBMs actively tunneling from an all time high of 17. A total of 37 breakthroughs have been recorded so far with the following 5 pending:

Package Section Status & Distance
UGC-01 Hutatma Chowk – CST (up-line) 248/408 rings completed (551m, In Progress)
UGC-03 Science Museum – Mahalaxmi (up-line) 419/752 rings completed (1118m, In Progress)
UGC-03 Mahalaxmi – Mumbai Central (up-line) 837m, Not Started
UGC-03 Science Museum – Mahalaxmi (down-line) 505/752 rings completed (1136m, In Progress)
UGC-03 Mahalaxmi – Mumbai Central (down-line) 830m, Not Started

For more updates, check out my Home Page!

– TMRG





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