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 ...

In the ethereal blue glow of the water, a huge shape swept toward them. Around 30 feet long, with four billowing arms and a domed head, the creature was larger than the tourists’ personal submersible.

The strange contraption slowly being assembled in a modest industrial shed in Breda, a small city in the Netherlands, bears little resemblance to Nautilus, the fictional submarine of Jules Verne’s ...

They go deep down into the ocean to help treasure hunters and historians uncover some of our world’s greatest artifacts. “All of a sudden out of the corner of my eye we see a bow of a ship, leaning ...