An classified overlay of methods to master the complex natural and geotechnical conditions for construction of underground works. Intervention methods to mitigate or to eliminate the unfarorable natural conditions. The technology to performe intervention. Powered shoring, shielding, extrusion, micro-tunneling, trenchless technology, freezing, kessons, dewatering, rehabilitation and reconstruction works and underground utilities. The course provides also forecasting methods to controle the development of negative effects and impacts in the rock mass. The second part of the course deals with the excavation of pits and shafts. It shows the designs for the site and excavating equipment in- outlet pit. It deals with conventional drilling and blasting excavation works, the problems of large-bore holes and wells. There is also an issue of blind digging trenches and blind shafts, deepening vertical holes, deepening and widening the pits. Knowledge and skills obtained by students completing the course: The student is introduced to the subject, it becomes familiar with the fundamentals, that are the relevant and constitute state of the art that is sufficient for the success of active work in that field and allows their self-improvement and development