https://www.cnet.com/news/elon-musk-says-thai-cave-rescue-could-involve-kid-size-submarine/

Elon Musk says a kid-size submarine made from part of a SpaceX rocket might be the way to save the schoolboys trapped in a flooded cave in Thailand.

The SpaceX and Boring Company CEO tweeted the thought Saturday, continuing his efforts to assist in a rescue. On Friday, Musk said workers with the rocket company and the tunnel-digging venture were on the way to Thailand to explore the possibility of using air pumps, an inflatable tunnel and ground-penetrating radar to save the children.