There are a handful of ultra-high-net-worth pursuits that sound tempting, but don’t really make sense. They’re typically wildly expensive and operationally inconvenient. And always difficult to ...

It’s a bird, it’s a plane, it’s Super Sub! U-Boat Worx’s just-launched, ruby-red flagship may have more in common with the original 1950s Superman than the color of his cape. The Dutch submersible ...

The design has the lithium batteries and thrusters at the rear so the pilot and passengers can enjoy the view. U-Boat Worx The three-person submersible has a “droplet-shaped hull,” according to U-Boat ...