Modern underground infrastructure development. Types and uses of underground structures – selected case studies Underground projects for hosting special use types. Underground space development and future trends – advantages and disadvantages. Environmental importance of underground development. Modified mining techniques for the development of underground installations. Design of underground structures using the principles of room-and-pillar mining method. Design of large underground rock caverns. Development strategies for mined spaces. Cost analysis of underground projects. Cost-benefit assessment of underground facilities. Environmental valuation of underground space development.