Due to fixed positive buoyancy, it always naturally floats back to the surface. And we mean always.
Let's presume you already own a yacht. Just indulge us – you have a yacht. Once sailing the high seas with one of those, this innocent thought pops to mind eventually: sure, the surface of the ocean looks mighty mysterious and all glossy-like, but surely there are greater secrets (you know, Atlantis and things like that) hiding underneath! Are you thinking what we're thinking? Enter personal submarine!
There is one that would suit us just fine. It looks very much like a state-of-the-art racecar, only it's actually an underwater quadcopter, or a submarine, if you will. It's called Deepflight Dragon and weighs 1800 kilograms. It's five meters long, two meters wide, measuring 1.1 meter in height, making it small, light and compact enough to fit on a yacht. Actually, according to the manufacturer, it is supposed to fit on practically any yacht, which is something other available submersive vessels can't do.
Deepflight Dragon is a completely electric, battery-powered submarine, enabling passengers to spend up to 6 hours underneath the ocean surface. It carries one or two passengers with a combined weight of maximum 250 kilograms. It glides through water very quietly, reaching 4.6 mph, while leaving practically no ecological footprint. Since it is also able to hover and take a 120-meter-dive, you can also use it to safely explore ocean depths, wrecks and underwater canyons.
This utterly attractive submarine is equipped with a DeepFlight Dive Manager (DDM), which is a proprietary technology that monitors and manages critical functions. The DDM allows practically anyone to pilot the Dragon with minimal training only. If the battery dies on you, you just simply turn the system off and the Dragon will float back to the surface automatically.
There is one thing, though, that will make you roll your eyes a bit. To become a proud owner of the quite exquisite Dragon, you will need to spend a staggering amount of 1.5 million dollars. Once you discover oil in your backyard, that's just pocket change, so chin up and dream away.