Billionaire Elon Musk and his company SpaceX have designed a "kid-size submarine" that they've sent to Thailand to help with the rescue of the remaining young soccer players stuck in a cave there.
Musk tweeted on Monday, "Just returned from Cave 3. Mini-sub is ready if needed. It is made of rocket parts & named Wild Boar after kids' soccer team. Leaving here in case it may be useful in the future."
Musk posted video and photos of the rescue sub, including video of his team testing out the device in a Los Angeles swimming pool and simulating navigating the sub through the narrow passageways of the caves in Thailand.
As of Monday evening pacific time, eight members of the youth soccer team had been rescued after being stranded in the cave for more than two weeks. Four other boys as well as the team's 25-year-old coach were still awaiting rescue from the Tham Luang caves, which became flooded from heavy rains. (NBC News)