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What caused delays in the Metro tunnel beneath the Hooghly River...

This question belongs to Geological Engineering Case Studies And Applied Geological Engineering Projects
Case Studies and Applied Geological Engineering Projects
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What caused delays in the Metro tunnel beneath the Hooghly River in Kolkata?

Answer & Solution
Correct Answer: Option C
The tunnel passed under the Hooghly River through water-bearing alluvial silt, leading to water ingress and requiring specialized TBMs and grouting.
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