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In which project was basalt rock tunneling a significant challenge

This question belongs to Geological Engineering Case Studies And Applied Geological Engineering Projects
Case Studies and Applied Geological Engineering Projects
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In which project was basalt rock tunneling a significant challenge?

Answer & Solution
Correct Answer: Option A
Mumbai Metro Line 3 had to tunnel through Deccan Trap basalt, which is hard and abrasive, requiring specialized TBM cutters and cooling systems.
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