The city on Mars is not only a technology and a minimum necessary for life.

While building Martian colony It is important to preserve the sensation of natural Mars and presence on it, because under the layers of protection we can easily lose Mars. We need to see the sky, meet the sunrises and sunsets and have the opportunity to walk on the Martian land without special protection, but be protected. A person must love the city and want to live in it.

In addition, the key criteria for Mars city building are ease and speed of construction, reliability, and local resources.
The flexibility of the city is based more on a quantitative, rather than a qualitative way of development (many simple but reliable, and not one complicated, but risky).

Therefore, the structure of the city horizontally and vertically repeats the foam structure. It is a freely connected cells of polyethylene. The bearing capacity of such cells is provided by the difference of pressures inside and outside the cell and printed bearing ribs from basalt and carbon. The cells create a multi-layered structure of the city.

Each layer provides better and higher radiation protection, a pressure of the atmosphere, temperature and amount of oxygen. All this allows the structure to be thinner. In case of failure of any element – the city does not die, but continues to work, gradually repairing the malfunctions, without threatening lives of the Martians. The city is situated in the mainstream of an ancient river (the Shalbatana valley). The gorge is covered with a multilayered dome. It is a supporting structure made of carbon nanotubes and Mars basalt, ice panels and panels with Martian soil. Outside, “cockroaches” (low-tech drones from Martian soil) walk along on the dome, they cover the translucent parts of the structure during solar flares, scan the dome and clean it from the Martian dust. The dome is supported by skyscrapers, which, outside the structure, are a storehouse of spare cockroaches and are used as stopping points for the external local electromagnetic transport system. Skyscrapers go underground to the water-bearing layer to extract water and other minerals. Life in the colony begins with the construction of the first skyscraper. The slopes of the gorge become terraced with agricultural land with useful city functions in the steps.

The forest with a river in the center provides public space, gives additional oxygen and humidity, but the most important is a psychological comfort. There are different opportunities for people in different layers of the city. In the lower layer, human walks barefoot and swim in the river, in the second layer under the primary dome he walks wearing a light protective suit. Ice cushions in the dome consist of ice rods, which function is to reflect, it provides an opportunity for people to see the real sky and enjoy the Martian blue sunsets. Thus, Martian colony is not a safety capsule on Mars, but diverse, comfortable, sustainable developing flexible city.