The Mumbai Metro project achieved a milestone by completing two tunnel works. First, one being the Underground Colaba-Bandra-SEEPZ, Metro Line-3 at Sahar Station confirmed by the Mumbai Metro Rail Corporation (MMRC). The tunneling work started at CSMIA T-2 and it took 105 days to reach Sahar. This breakthrough was a part of the package – 6 where 687 meters tunnel was driven by the tunnel boring machine (TBM) Tapi -1. 

The second breakthrough was achieved at Mumbai Central Station where the 3.8 km long tunneling boring work was completed on 2nd August 2019 between Azad Maidan and Mumbai Central. MMRC’s Managing Director Ashwini Bhide claimed this to be the most challenging work as the tunnel was located in one of the most densely populated areas with 169 sensitive structures and many old dilapidated buildings. Among these structures were 28 heritage buildings, 14 high-rise buildings, and religious structures. Post the construction of a geological survey and a structural survey carried out in 30 meters influence zone on either side of the alignment, a team of 32 people completed the work which included Engineers and workers. The difficult task took 20 months to complete with incessant drilling underground with a boring average of 190 meters per month with 2720 rings as mentioned by the Mumbai Metro Rail Corporation (MMRC) spokesperson. 


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