Tham Luang cave rescue incident is taking combined effort of Engineers throughout the world. Various news media is telling currently it is not possible to pass more than one person through some very narrow portions of the cave tunnel (so the boys have to learn diving within cave).
This is a Map by BBC, perhaps from here of BBC; showing the narrow places in cross sections.
Now; my question is; why the engineers are not attempting to use abrasion (with a grinding wheel or such thing) and rock cutting wheels to broaden these "too narrow" parts so that later on 2 people (a diver carrying a boy) can come out at a time?
Is there any hidden risk of attempting so? Is that the cause for not atempting so?