There are a variety of different personal submarine designs out there, but few are as versatile as the Undersea Aquahoverer.
Intended for easy use by even amateur aquatic enthusiasts, the Undersea Aquahoverer is purported to be like driving a car, so anyone can get behind the driver's seat. The underwater vehicle is designed to automatically hover in the water when not being directed without having to constantly balance the various instruments. This allows drivers to take a more leisurely undersea adventure and admire their surroundings rather than constantly keep track of controls.
The Undersea Aquahoverer submarine design is available for purchase from Hammacher Schlemmer for $1.5 million. This might seem steep, but considering the advanced technology that makes it so easy to use it's actually something of a moderate price point.