Ever looked at a project that seemed so out there and fantastical you thought, "That will never materialize beyond pretty computer renderings on my touchscreen?" We do so multiple times on any given week, but some such projects actually do make it to the real world. The nimble, high-speed Super Sub creator U-Boat Worx calls the fastest, most advanced private sub ever built arrives as the latest. Not only has this impressive subaquatic projectile made it to production, it's officially on its way to the first buyer, giving a fortunate fractional-percenter what's sure to be an addictive, highly immersive new hobby.