In 1950s, Stommel proposed an idea of "perpetual salt fountain".By making use of this idea, we have succeeded in an experiment of upwelling the nutrient-rich deep sea water. We have proposed a large, artificial upwelling facility in the sea areas such as Okinotorishima Island, and "the Laputa project", which cultivates the sea areas called "ocean desert" with low productivity, into the rich ocean forest.