And Musk hat to brag about building a submarine. Don't want to call him an idiot, but as a start explore the caves of Sagada in the Philippines. Then talk about escaping in such a flooded cave with a tiny submarine. https://wikitravel.org/en/Sagada

Diving in caves is dangerous as f.. and requires a special training. Not sure that cave diving is part of a Navy Seal training. I read the dive out of the cave takes five hours. Hands of to the SEALS and kids for pulling it off.