In 1960 Jacques Piccard and Don Walsh visited the deepest place on earth – the bottom of the Mariana Trench, almost 11km beneath the surface of the sea. James “Terminator, Terminator 2, Titanic, Avatar, Aliens and The Abyss ” Cameron repeated the feat in 2012.
Want in? You can. OK, you might not be able to go quite that deep, but Netherlands-based U-Boat Worx can help you get at least some of the way.
They let us film in their top-secret factory and talked us through what the super-rich can expect from their submersible playthings – from construction to piloting to four-inch-thick bubble-domes to what happens if it all goes pear-shaped.