The geological soil types and the history of loading influence the characteristics of soil and are therefore very important to the design and construction of subsurface constructions. Remember that geotechnical influences should always be taken into account when considering subsoil constructions. The changes that take place due to activities in the subsoil can cause great damages to surrounding buildings. In this chapter we will look at several geotechnical aspects such as homogeneity, deformations, settlements, safety factors et cetera.