We have developed robots capable of flying autonomously in environments where Global Navigation Satellite System (GNSS) is not available. Using our robots, we can provide accurate, high-resolution 3D models and other visualizations to determine the condition of an infrastructure nearly in real-time.This innovative approach is beneficial to carry out inspections of underground, closed or confined areas. This is particularly the case under harsh, dark and dangerous conditions where the inspection process based on current methods entails a major health risk for human operators. Besides the gain in safety our approach boosts the overall efficiency of the process as well as the accuracy of the obtained results.The solution was successfully tested on a global scale in real environments such as underground mines, penstocks in hydroelectric dams, nuclear waste detection and tunnel construction. Further industries have shown significant interest in the technology to carry out inspections.We consider ourselves as a data service company, where the inhouse-developed robot is used as the main tool to gather the data. One of our principles is to keep the highest possible manufacturing range in-house ensuring the control of the supply chain, the delivered quality to the customer as well as the corresponding lead-time.