I saw that. RIP, he was a genuine hero.

Thai Cave Rescue Diver Dies From Lack of Oxygen

I tend to stay out of these discussions, but only fully trained cave divers should be attempting any diving inside a cave. SEALS (US or otherwise) are highly trained, but not for this type of diving. It is literally the most dangerous type of diving possible, and probably the most dangerous "sport" out there. Mistakes are generally fatal. Almost every cave in the US that you dive in has a "STOP YOU WILL DIE" placard at the entrance. It is a standard thing.

I was (am) fully cave trained, but I am way out of practice which is also necessary to maintain proficiency. I feel for the families (trapped and rescuers) as this is a really bad place for everyone. Looking at the video feeds and the equipment set-ups, there will unfortunately be in all probability more fatalities.

Regards,
Bill

It appears the monsoon rain may be in charge of the decision making...
Thai Officials Clear Media as Cave Rescue Seems Imminent

After one diver died on the return dive, and considering the skillset of the boys, I really thought the idea of swimming them out was set aside. Weather...

Or maybe the media has simply become a nuisance.

...or maybe it's something we haven't seen before.

Rescue underway. Unofficially two are out.

Live News Feed, BBC

12:30 UTC

Six out.

Second article, Six Thai Boys Rescued from Flooded Cave


From reading it appears the decision was made because with water levels in the cave lowered, parts of the cave were walkable and waiting would only allow the monsoon rain to fill it back up. Somebody made a decision to go for it.

14:30 UTC

Four out in total. Resume operation tomorrow.

Good news they've gotten 4 out.

Presumably they have restock the gear caches (air tanks etc) along the route for the next group to make their attempt.