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Tunnel Triumph: Mumbai Metro Line 7A Surges Past 60% Completion with Airport Link Breakthrough

Updated: July 20, 2025 09:07

Image Source : Times of India
Mumbai’s ambitious Metro Line 7A has crossed a major milestone with the successful completion of its final underground tunnel, marking 61% overall progress and bringing the city closer to seamless airport connectivity.
 
Key Milestone Achieved

- On July 14, 2025, Tunnel Boring Machine Dhruv completed a 1.65-km upline tunnel between Andheri (East) and Chhatrapati Shivaji Maharaj International Airport (CSMIA).

- The tunnel, built at depths ranging from 12 to 28 meters, features a finished diameter of 5.6 meters and was lined with 1,178 precast rings.
 
Engineering Feats and Challenges

- The tunnelling operation navigated complex urban infrastructure, including:

- Crossing beneath the Sahar Elevated Road

- Passing over Metro Line 3

- Diverting a major 1800mm sewer line and underground water mains

- The breakthrough follows the earlier completion of the downline tunnel by TBM Disha in April 2025.
 
Project Scope and Connectivity

- Metro Line 7A spans 3.4 km, with 2.5 km underground and 0.94 km elevated.

- It includes two stations: Airport Colony (elevated) and CSMIA T2 (underground).

- Once operational, it will offer a direct interchange with Metro Line 3 and eventually integrate with Lines 2A, 7, 9, and 8, enhancing north-south and east-west connectivity.
 
Looking Ahead

- The line is expected to be operational by 2026, though system installations and station development may extend the timeline to 2027.

- Commuters from Mira-Bhayandar and Dahisar will benefit from faster access to BKC and South Mumbai via a single interchange at the airport.
 
Sources: Times of India, Free Press Journal, News18, Metro Rail Today, Indian Express, Lokmat Times.

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