The work deals with the possibilities of emergent urban strategies, bottom-up systems exploring capacities and the possibilities of multiple and adaptable systems. Topological thinking connects urbanism with architecture. The project develops a forgotten artificial heap in the middle of the city and transforms it into a sustainable, structured cluster of residential, development and technological units. The successive strategy preserves the qualities of the area and develops the hidden potential of the place. The discrete architectures of the units are articulated in a coherent language based on the original factory designs. A key element of the hydrogen city is a factory for the production of hydrogen and its bottling, which expands into the production part of the units themselves. Each unit fulfils a different purpose from residential, to share, to energy, which retains energy or purifies greywater. Independency on other supplies of energy open discussion about a new way of living and working, or energy is free and there is no car needed in the hydrogen island. All circulation is reachable to 15 min walk or via cableway. Units are located into forest nature, the main moment is a central lake also serves as a recreation.