We know more about the surface of the moon than we do about what's going on beneath the waves, so do your bit for science and get exploring the ocean in what is one of the coolest and sexiest contraptions we've ever feasted our GearCulture peepers on. The U-Boat Worx Cruise Series Submarines can reach depths of up 1,700 meters, with up to 11 onboard. Customization options include privacy screens, toilets and lounge seating.