According to one of Musk’s tweets, he says that based on the feedback that he’s gotten, he thinks that a kid-sized submarine using liquid oxygen could be how they will be able to extract the boys from the cave. One of the problems faced by rescuers is that the boys do not know how to dive, and the path leading out of the cave is said to be complicated even for seasoned professionals.
The next problem is time, where due to it being monsoon season in Thailand where it rains almost everyday, the water levels in the cave are rising which means that it is a race against time to try and extract the boys and their coach ASAP. When asked how long this submarine would take to manufacture, Musk replied by saying that he estimates construction should take 8 hours, followed by a 17 hour flight to Thailand, meaning that it will take a little over a day before rescuers can start using it.
It is unclear if Musk’s solution will work, but we suppose any and all help is appreciated. Plus given that Musk is known for his “out-there” work, perhaps this is what is necessary to help bring everyone home safe and sound.