Teams autonomously mapping the depths take home millions in Ocean Discovery Xprize

There’s a whole lot of ocean on this planet, and we don’t have much of an idea what’s at the bottom of most of it. That could change with the craft and techniques created during the Ocean Discovery Xprize, which had teams competing to map the sea floor quickly, precisely and autonomously. The winner just took home $4 million.
A map of the ocean would be valuable in and of itself, of course, but any technology used to do so could be applied in many other ways, and who knows what