Abstract: In the system, the data, which are acquired in a decentralized manner, are evaluated centrally. Multiple at least temporarily mobile modules are arranged at various positions of a respective underground structure and the temporarily mobile modules are designed to acquire and buffer store measurement data and to transmit acquired measurement data wirelessly and automatically to multiple fully mobile modules as soon as a fully mobile module has reached a distance from a temporarily mobile module at which a wireless data transmission between a respective temporarily mobile module and a fully mobile module is possible. Fully mobile modules are designed to buffer store data that have been received from at least one temporarily mobile module and, upon reaching a data access point that is connected to a central acquisition, evaluation and/or storage unit, to transmit these buffer-stored data to the respective data access point.