After many years of conquest of new soils by man, many footprints of those trips remain. Even if those trips might have been justified for researches and for the development of our knowing of the environment, those reasons could be transformed in real obstacles for our future. The City Collect project proposes the idea to created three hulls, an accommodation, a laboratory hull and a vacuum to collect all debris and agglomerate them and use them as construction materials to create a long term life in space.