You may fantasize about owning a drone aircraft like the ones that the US uses to take out terrorists on the far side of the world. But you know that's not going to happen.
But how about having your own small aquatic drone which has a camera that you could use to view things on the surface or underwater and which you could control from a smartphone or tablet? That is close to reality.
Check out Ziphius: The Aquatic Drone.
And watch this video.
What would you use it for?