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In the Olmos Trans-Andean tunnel project, what was a key geological issue?

A. High geothermal gradients

B. Permafrost

C. Weak phyllite and fault zones

D. Karst voids

Answer: Option C

Solution (By Examveda Team)

The tunnel passed through the Andes, encountering phyllite and crushed fault zones, which required ground support and drainage strategies.

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