So, is it absolutely decided then, that there's definitely nothing like a diving sack/cocoon that they can be put in, and pulled through, in case the most narrow parts don't get fully pumped out?
From what I'm reading this AM- diving them out using any means
is the last option considering the dangers.
Read somewhere that most Thai people do not swim and to them
diving underwater is a horrifying thing. In fact their word for
underwater diving is something like "black water".
This is why I believe they have changed their minds on diving them out. MOO, I believe they tested the kids and coach to see
if a crash course in diving could be accomplished and this did not go particularly well. IME, the older people are before they learn
to swim, hold breath underwater
Someone posted a proposal to send a hyperbaric stretcher on Twitter yesterday. Just now someone else posted about another kind of stretcher which has oxygen and everything but is not encased. All the divers need to do is pull that stretcher along with them, kid just lying still and breathes. I guess the concern is still the narrow passage(s)? AFAIK there's no official comment on these proposals though I would think that they discuss whether they can be used or not.
There are sections within the cave that are steep and need to be climbed up- think mountain/cliff climbing but underwater. and this adds to the difficulty of bringing the kids out. When Thai officials originally advertised on FB- seeking volunteer cave divers- they specifically mentioned only people experience in
underwater cave climbing experience- 45 deg. climbs for some
distance. It's much more technically challenging than we can even imagine.
this is why cave diving , in general, is a dangerous activity and every year people die diving caves, recreationally. It's not for the faint of heart.