The underground is going through a new golden age. Worldwide, major cities are investing in the construction of new underground lines and improving their existing networks. New stations are being built and, at the same time, new standards of design, accessibility and functionality of the environment are emerging. In addition, the marketing of the underground is changing. The underground aims to operate as a modern service that offers a wide range of services to users: from transport cards to free wi-fi. Time underground is becoming more diverse: exhibitions and excursions are held in the underground, cultural projects are realised.

• How can the quality of the user experience be improved in the underground?
• How does the architecture of the modern underground function?
• What services are developed in the underground?