You want massive amounts of desalinated water from the ocean? Set up a heat exchange system powered by nuclear energy, essentially a huge distillation tower, to first boil the sea water, then collecting the condensate and piping it out as “fresh” water. Of course, this means a huge pile of the solids in the sea water, the sea salt, builds up around the distillation tower, which could be used as an enormous resource of all the minerals dissolved in sea water, in the resulting brine or dried residue. Most of the content would be sodium chloride, of course, but there is just about every other water-soluble substance as well, including potassium chloride, an excellent fertilizer, considerable amounts of phosphorus, and all the other lesser minerals like calcium, magnesium, zinc, and all the trace minerals that have been incorporated into living tissue. There is even some amount of gold and other precious metals present in the form of ions, which would make the sea salt one of the more valuable ores to extract all these metallic elements.
Evaporation of sea water is a prime technique for harvesting lithium. btw.