The oxygen levels are getting low.
This seems like a solvable problem, using ECLSS technology. Get some LiOH canisters and oxygen tanks in there. Also, Elon has sent some of his tunneling engineers to see if they can help.
[Update a couple minutes later]
Alan Boyle has the story on the Boring Company and SpaceX support. The former would presumably be tunneling, while the later would provide life support based on Dragon technology.
[Noon update]
Elon has gone full superhero.
[Update a while later]
[Update Saturday afternoon]
Elon is building a mini-submarine, designed to fit through the tunnels, at SpaceX HQ to fly to Thailand.
Early-morning update]
Thought their politics suck, The Guardian is providing good live blogging of the operation.
[Monday-night update]
There were questions in comments how they got there. Here is Bridget Johnson’s story, including how the Buddhist monk training of the coach helped get them through.
[Bumped]