There isn't a best solution to this, it's a crap crap situation.
Kids can't swim, well that sucks, but they gonna learn that pretty fast, never the less, it's irreverent, the navy drivers will just pull and push them out and from my understanding from reading about it, it's not really swimming anyway, since the tunnel system is small, they just "swim crawling" through the tunnel, I guess that' show you describe it? Using your hands and arms against the tunnel sides to swim through.
There isn't many solutions to this.
1. Leave them inside for 4 months?
Runs the risk of more people dying bringing them food, water oxygen, whatever else for 13 people, how much food, water and supplies do you think each driver can bring them to survive?
Rain season is coming, that could flood more of the cave and drown them, I doubt the pumps can pump out water faster then mother nature during the rain season.
Any part of the tunnel can collapse, blocking access to the 13.
Oxygen levels in their part of the cave are dropping.
With no safe place to go to the toilet, the danger of disease will keep rising, where is it going now?
2. Providing pipes and cables to provide them water and power.
That doesn't really change anything said in 1.
3. Dig down to them?
Too far and risk danger of collapse.
This isn't Thunderbirds, drilling through 1 mile of mountain right on top of the small cave they are hiding inside sounds batcrap insane.
Really, there is no other solution other then to get them in driver suits and get them out, the rescue effort themselves have said the same thing, give them some limited training and get them out.