This spatial installation consists of video screenings and large-format prints. A multitude of openings and covered manholes provide visible references to the underground (and therefore invisible) system of sewers in the urban landscape. The manhole cover therefore represents an interface between two worlds: between above and below; between the everyday and its basic infrastructure. It marks the moment of transition, the possibility of a change of side, and thus perhaps also a change of perspective. Investigations in the Underground explores the parallels and intersections between the two systems in an associative way. It also raises the question of the relevance of seemingly incidental objects. Due to the invisibility of the system, there are few points of contact in everyday life. It primarily becomes visible when problems arise and a confrontation takes place. Which topics get our attention, and why do we not want (to see) certain things?