The July 20 incident is likely to have occurred due to an isolated patch near the face of tunnel 4B, which was sudden and gave no indication or time for the safe evacuation of the people working inside the tunnel, the NHPC says
The July 20 incident is likely to have occurred due to an isolated patch near the face of tunnel 4B, which was sudden and gave no indication or time for the safe evacuation of the people working inside the tunnel, the NHPC says
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