Metro-3 Project: 5km subway construction completed

The Tunnel Boring Machine (TBM) has been used for the digging process and is an advanced digging machine which causes limited disturbance underground. The construction of the 5km subway of Colaba-Bandra-SEEPZ route of Metro-3 has been completed and the remaining work is expected to speed up after the introduction of extra TBMs


Mumbai Metro Rail Corporation (MMRC) has speeded the work of Colaba-Bandra-SEEPZ route of Metro-3 despite the heavy rains in Mumbai. Also, the work of digging down the subway through the TBM in Mumbai is in full swing.

MMRC Managing Director Ashwini Bhide said that within a span of 10 months, the work of 5,100 meters (5 km) of subway out of the 32.5 km metro route has been completed.

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Metro-3 is a complete underground project and so it has been very difficult in a city like Mumbai. MMRC's biggest challenge was to work without unsettling underground channels and old buildings. In order to overcome the challenge, MMRC decided to dig the subway through the TBM based on the latest technology. Accordingly, MMRC had asked for 17 state-of-the-art TBMs and 15 of the machines have been submitted to the metro construction company.

Bhide said that eight of the 15 machines have entered the core of Mumbai and the work of digging the subway is being conducted by these machines and after the span of two years, the machines will come out by digging a 32.5 km subway. She assured that all 17 TBMs will be operational by October 2018.

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The first Tunnel Boring Machine was released into the ground and after that, the remaining machines were also put up to the task of digging the route. In the span of 10 months, the eight machines have dug 5km of the Metro-3 route and after releasing all the 17 machines, the work is expected to speed up tremendously.

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