Between July 2011 and September 2016, the Bangalore Metro Rail Corporation Limited (BMRCL) struggled to tunnel the 9-km underground stretch of Namma Metro Phase-I. Back then, it deployed six tunnel boring machines (TBMs) and the average time taken for tunnelling one kilometre was about seven months.
This had a cascading effect: the underground section remained a bottleneck all through, rendering the metro corridor in South Bengaluru unusable although it was ready for three and half years. The BMRCL blamed complex geology and dense population for the delay. Read more
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