Almost as exciting (and useless in everyday life) as the personal flying machine is the personal submarine. Engineered with all the components of a large submarine, the Aquarius from Subeo is now available for $1.5M from Latest Buy. The submersible craft holds 3 people, can dive down up to 50 meters, holds 3 hours of Oxygen and can move along at up to 7 knots. Want to see one in person? I'd expect someone in the Hamptons or Malibu to be among the first with a Subeo.