I think the worry is the cave could completly flood if heavy rain continues., fn nightmare.
wonder if they could dig a series of test holes, and use triangulation, to help locate the cave if they can bang on the walls and be heard..
area may be too remote and terrain too steep for it,
The above article is about an engineer that was already drilling in the jungle near the cave. Here in the US they can move fairly large rigs (in pieces) by helicopter. They build structures for them so they can be perched on the sides of very steep slopes as well.
Down in California they often drill large diameter holes so a geologist can be lowered into the hole to look at the geology! I’m not sure if they still do that, but I think so.
The article said the engineer found some other access points and roped down them and they lead to other tunnels/channels that are blocked with boulders but they might lead to the boys.
I think the risk of collapse for drilling is pretty slim. Case the hole as they go, and maybe the last 5 feet will collapse. But - try to get it in that large room just down from them and closer to the entrance I would think that would be no issue.
A previous poster talked about systems used by cavers to send a signal to the surface for accurate positioning.
Another article on that page that pulls up for the one I posted talks about a “boy with no country”. He is a refugee from Mynamar - goes to a Christian school in Thailand. Is the only one in the cave that speaks English, which was great seeing as the first two rescuers were from England. (Also speaks 3 or 4 other languages!).