"Save the world" is such a broad term. It really depends on what things about the world you find to be most important.

If your primary concerns are safety from hazardous ocean-based weather, security of offshore energy generators and fisheries, and a better understanding of the ocean's effect on climate change, Liquid Robotics' technology would certainly qualify as "saving the world".

It is just a different direction toward energy independence which could evolve in to something bigger.