Detailed text transcripts for TV channel - CNN - 20180705:21:52:00
Way or possibly drill a hole in the mountain. experts say there are challenges. >> the big problem with drilling or finding a natural opening is of course it needs to be tied into where they are. they're in a very small target area. if they are several hundred meters below the surface, you can't just start drilling and poking holes in. you need to know the point out on the surface that you want to start drilling. >> reporter: another possibility, pumping water out of the cave, has so far failed. experts say that still could be the best option tonight. but it's rainy season so the caves could b...
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