The article deals with the construction of a geophysical observatory in the town of Fürstenfeldbruck, Bavaria, Germany. The observatory is being built for the Technical university in Munich. The main function of the observatory is to measure changes in the Earth ́s spin rate or, its axes deviations etc., which can occur with physical impulses in a form of, for example, an earthquake or nuclear explosion etc. Measuring such physical phenomena is important and the data is used to adjust navigation of satellites orbiting the Earth. As there were installed unique measuring tools in the building, the construction materials and building process itself has had to be carefully chosen and though through. The observatory is placed underground and has shape of a tetrahedron. The top of the construction is oriented in direction to the Earth ́s centre. To secure the pit the sprayed shotcrete was used and reinforced with AR Glass. To anchor the pit horizontally they also used the AR Glass. After finishing the pit, the central shaft was built and situated vertically from the top of the tetrahedron in direction to the Earth ́s surface and to the top of the tetrahedron base. Under a layer of concrete, there is a PE HD pipe DN 630 in every wall to connect the tetrahedron top with the base tops. There are several concrete shafts situated in each top tetrahedron base and also, at half of the span between the tetrahedron base tops. All these concrete shafts on the ground are interconnected by plinth beam with one another. The plinth beam contains three PE HD pipes DN 140. This type of construction was chosen as there is laser circling in the tetrahedron base, its top, and between tetrahedron top and base. In every shaft there is installed a measuring instrument, which is very sensible when in contact with steel parts. The sensibility to steel was a reason for employing only glass reinforcement GFK in every concrete part of this construction.