The Massive Ark Building, is a design proposed for the program Remistudio “Architecture for natural disaster relief” of the International Union of Architects campaign. Its circular structure without angles and protrusions can protect people in case of earthquakes, floods and tsunamis. The support system of cables basis weight distribution along the entire interior, allowing the balance and stability. The Massive Ark Building has installations of photovoltaic cells that absorb sunlight providing a 100% sustainable illumination. The dome keeps hot air that builds up during the seasonal heat propitiating a steady supply of energy to the whole complex independent external environmental conditions. Because it is an ark to be used only in case of a natural disaster, its design is planned to be built in a fast and easy way.