It delimits cities, separates continents, gives birth to civilizations and is capable of making them disappear. Water has always been a fundamental factor. It has defined everything from our way of eating to the way we live in our cities, as well as the plastics and construction materials that protect us from it. Analyzing that the eco-duct is defined based on the interaction with water networks and natural intakes, the project proposes using water as a transforming element: avoiding the natural reaction of oxidation with steel.