Yup bitmask pretty much nails it, the sci-fi like scenario. You gotta admit Musk is a master marketer and fixer... he's got no obligation to help. While other tech companies wamekunja mkia - Musk sees a real role for SpaceX and the Boring Co. This is an irresistible candy store for him
I think supplying oxygen and foods and waiting out the Monsoon for a few months is a last resort. Anything could happen including a cave collapse with the human intrusion. Drilling a tunnel through solid rock sounds suicidal. Getting the boys to dive out - perhaps each accompanied by a proper diver - could be it. There is a sizeably long 70cm thin section where each diver must swim alone.
Stuff for sci-fi. Musk's boldness is something else. The world is really watching this time.