TBM Anaimalai has 275 metres out of 410 metres so far; Two more TBMs have been tunnelling from Madhavaram for Corridor 3 and one of it has bored 790 metres and another has completed 351 metres.
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.thehindu.com/news/cities/chennai/chennai-metros-phase-ii-project-tunnelling-work-picking-up-pace/article66850006.ece
Chennai Metro’s phase II project tunnelling work picking up pace
www.thehindu.comOne of the first tunnel boring machines (TBM) that began boring in the city from north Chennai for Chennai Metro Rail Ltd.’s (CMRL) phase II project is expected to reach its first destination next month.