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Mumbai Metro Line 7A Achieves First Underground Tunnel Breakthrough

TBM Disha completes 1.647 km tunnel between Andheri East and CSIA Terminal 2, marking a milestone for MMRDA's metro expansion.

Mumbai, India - April 17, 2025: The first TBM tunnel breakthrough was achieved by the Mumbai Metropolitan Region Development Authority (MMRDA) for Metro Line 7A. This marks the successful completion of a 1.647-kilometer tunnel between Andheri (East) and Chhatrapati Shivaji Maharaj International Airport (CSMIA). The TBM, named Disha, is the first underground tunnel constructed by MMRDA for its metro network in Mumbai, India, on Thursday, April 17, 2025. (Photo by Satish Bate/ Hindustan Times) (Hindustan Times)
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Overview

  • The breakthrough, completed on April 17, 2025, is the first underground metro tunnel achieved by the Mumbai Metropolitan Region Development Authority (MMRDA).
  • The Tunnel Boring Machine (TBM) Disha excavated a 1.647 km section of the 3.42 km Metro Line 7A, connecting Andheri East to Chhatrapati Shivaji Maharaj International Airport Terminal 2.
  • This tunnel is part of a 2.49 km twin-tunnel stretch that runs underground, with a diameter of 6.35 meters and specially designed precast ring segments.
  • The project faced significant engineering challenges, including navigating geological complexities and crossing major sewage and water channels.
  • Once operational, Metro Line 7A will integrate with other metro lines, reducing travel times by up to 60 minutes and enhancing connectivity across Mumbai's western suburbs and key transit hubs.