Nepal tunnel rescue: Geologist maps the deadly conditions

Around 900 people working inside Nepal's hydropower tunnels are among the missing after the devastating floods in the China-Nepal border regions.

Prof. Arnold Dix, a geologist, engineer and tunnel expert consulting on the rescue effort, describes the conditions in the tunnels and what rescuers are doing now.

0:00 Around 900 workers believed to be trapped in hydropower tunnels
0:28 Prof. Arnold Dix, tunnel expert, on likely conditions inside tunnels
4:25 Dix: "Even finding the spots to dig. . .has been an enormous challenge"
5:22 Anderson Cooper speaks with Prof. Arnold Dix

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