Meh, I’ve seen a few of these pop up and get articles written about them over the years. They usually disappear soon after. Probably just trying to scam money from Investors.
Unless it’s a nuke sub that lets your rich ass just disappear under the water I don’t see the point. Cruising around under the surface with a snorkel up on diesel engines just seems like a straight downgrade. Why even go out of your bunker.