When designing and monitoring the construction of tunnels and other underground structures in various geological hill environments, Geoportal pays great attention, based on high expertise and years of experience. This is reflected in the confidence of clients and the way engineers work, who have been involved in complex underground construction projects for a long time, taking into account specific knowledge and their own innovativeness. The design and construction of underground structures have specific characteristics with respect to other building structures, as there is often an increased degree of risk as a result of changing geological, hydrogeological and geotechnical conditions in the natural hill environment.