The feasibility of using underground space is determined by the particular terms of urban planning and feasibility studies. Unlike terrestrial, underground construction can be built in any conditions, even difficult and confined spaces. The main condition for the systematic and increasing use of underground space is its functional and organic interrelation with the urban a terrestrial planning and development.
The importance of providing competent relationship between surface and underground environments has not only a great role in building the structure and functioning of certain processes in it, but it also influences the human psychic. It is necessary to create conditions that will "erase" a feeling of deep space deprived of natural light and will help minimize the differences between them. In poor lighting conditions, the use of incorrect color, space and volumetric solutions produces a great risk of endangering the psychological stability of even the healthiest person. There is a risk of dizziness, feeling of false alarms, disorientation and deterioration of the human health as a whole.
Methodology solutions to these problems are rather simple. It is based on the simulation of ground space, however with a greater expenditure of resources for illumination. Also filling the environment green plantations and glass surfaces helps to improve the final effect. On a subconscious level, plants are associated with something located on the ground, and therefore are good to eyes and create a feeling of security.
As a result, taking into account the psychology of underground urbanism, the necessary level of confidence will be achieved soon, it will allow architecture go to a new stage in the evolution of human consciousness.