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Old Today, 02:53 PM   #15881
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Join Date: Oct 2016
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Originally Posted by de_rogue View Post
Kolkata soil is best for digging tunnels at good speed, the speed is slower just because of heritage buildings. Hyderabad and Bangalore are in the plateau region, so it gets a bit tough, Mumbai, being a coatal city, it's quiet challenging to build u/g tunnels that too through the reclamation area.

In Mumbai, they are saying 2nd city in India to have under river tunnels, that too Mithi river! Mithi river is like tolly nullah (little bigger), you can't compare it with the Ganges ofcourse.
But despite dangerous buildings and heritage structures Tbm rachna is boring at average speed of 20 Mts a day which is good enough I think . Can a Tbm bore at a higher speed than this. K olkatas biggest problem is inability to demolish buildings required for station construction etc. So no subodh mullick square station.
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