This is an invention meant to produce, eventually, an island in international waters, to legally found ones own state on it. That’s because of the difficulties of choosing an island for such an endeavour … there is essentially no terra nullius left.
The idea is this: one or more solar powered, autonomous, self-steering, unmanned ships that has an excavator on board that will dig up stones etc. from the sea bed. When full, the ship drives fully automatically to a GPS location for dropping the dirt. It does so night and day, driving within an area that is closed for normal ship traffic. But it also has radar with automated evaluation on board to avoid collisions.
The ship also needs a catapult-type device for unloading the dirt once an area is too flat to float over it, or even is visible as land but needs to be more elevated above sea level.
Of course one would operate these ships in shallow waters, ideally dropping the dirt over something like a sunken atoll or something else that has less than 20m water above it.
And of course, the politically correct way today to reason for this invention is to “help those islands endangered by global warming”. Governments would let rain down the money to build the technology for this … and if not, there is a polemic video to persuade them. Yea, or show them the stories of all these “submerged islands” already existing. And then, after the technology was in use for some years, I would get a chance to rent it for building my own island-state … 🙂