Geometry As the city is located in an arid climate, conditions in the surface can be really strong. In order to avoit that, the city is created underground, so that a fresh microclimate can be created. Desalinating sea water and filtrating solar exposure, food production can be guaranteed. The geometry of the city is created from a rectangle. There is a public attraction point in each one of the vertices: V1: Industry / Water purification / Waste management V2: Primary + secundary education / Leisure V3: Administration / University / Cultural V4: Market / Sports centre / Hospital There is an external conection that reaches the exterior from each vertice, working as public space as well as conection. C1: Sea: Desalinization plat / Auditorium C2: Car parking / Solar-eolic tower C3: Train station / Solar eolic tower C4: Pedestrian access Housing and tertiary working (offices & shops) are located near and in between these nodes. Meanwhile, fields for food production are located around the city, creating a green ring that also works as a big park. By general law, housing and offices will be always profit two opposite orientations (north-south, east-west) in order to have good ventilation. In addition, facades work as shadow devices and the fact of being underground avoids direct sun exposure and high temperatures. Energy production Sun radiation heatens the air below the glass-skin, which acts as a big hot air colector. Hot air is lighter than cold air, so it goes up the chimney. After reaching the turbines, kinetic energy is created, which will be transformed into electric energy thanks to an alternator. After this use, clean air is expelled again to the atmosphere. These two towers also act like transport conections, because they work as a train station and a car-parking. People will change scale in this nodes, to get down and enter in the city scale. Secondary energy will be produced using waves energy, biomass energy and from burning the waste that canot be neither reused or recycled. Transport The aim of the transportation system is to have some external conections in the edges of the city, that will act as main scale-changing nodes. This avoids private transportation issues, as the compacity allows easy movement walking or by bicycle. However, a radial transportation ring is conceived to make goods, food or people transportation easier.