https://www.techradar.com/news/elon-musk-wants-spacex-to-build-a-kid-sized-submarine-for-thailand-rescue

With the rescue of the 12 boys and their football coach stuck in a cave in Thailand now reportedly underway, entrepreneur Elon Musk has been sharing his plans for helping the effort: apparently one of his companies, SpaceX, has been busy working on ideas for a "kid-size submarine" to get the boys out.

It would utilize parts used in the construction of the space firm's Falcon rockets, Musk says. He's promising that the sub would be "extremely robust" – small enough to get through the tight cave network, and light enough to be carried by two divers.