‘We used 17 TBMs to create one of the longest Metro tunnels in India’
Subodh K Gupta, Director (Projects), Mumbai Metro Rail Corporation (MMRC), speaks to Sweety Adimulam on the challenges faced while digging through subterranean Mumbai.
How much tunnelling was required for the project and how did you go about the task?
We had to construct a 56-km-long tunnel for Metro Line 3. For this, we deployed 17 Tunnel Boring Machines (TBMs). These TBMs were of four different types and were deployed in areas based on the geology of places that they were to dig. While tunnelling we had rock all along. We needed machines that could negotiate these geological changes.
