For those who have everything
If the only thing that's kept you from buying a submarine was the complexity of the controls, "it's time to get your checkbook ready." The Undersea Aquahoverer ($1,500,000) makes navigating underwater as easy as driving a car, because it's designed to hover in place automatically when not being directed by either driver. Created by Hammacher Schlemmer, the craft can operate at depths to 400 feet and has six ducted propellers that'll move it in any direction. If you spot a shipwreck or interesting marine animal, you can chat with your co-pilot through a built-in intercom system.