15 (FIFTEEN) Tunnel Boring Machines to arrive for Metro work at Chennai Metro’s phase II work.
https://www.thehindu.com/news/cities/chennai/tunnelling-machines-to-arrive-for-metro-work/article30669925.ece
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CMRL plans to complete boring work on 21-km stretch of phase II in two years
cover tunnel photo by: Matt Brown from London, England / CC BY
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