ERRATA is a flexible solution empowering rescue or operational teams deployed in hard-to-reach hazardous environments, with the right tools to detect a possible danger quicker and safer. In the project context, a hostile environment is an area with no available communications infrastructure, limited or no human access, and possible physical threats to safety and security. ERRATA integrates: i) an aerial robotic platform able to autonomously operate in confined dangerous spaces; ii) automated sensing equipment to detect hostile conditions; and iii) resilient connectivity to communicate any detected danger to safe remote teams for post-disaster management. The solution is the embodiment of a shared common vision of INSIGHIO & VERTLINER, two Greek deep tech SMEs specializing in cutting-edge ICT systems development and integration – with a focus on network, IoT, robotics, and data analytics. These are assisted by APOGEO Space (APOGEO), an Italian NewSpace company developing a nanosatellites constellation capable of providing global IoT connectivity based on a ground-breaking technology that can be used in hybrid terrestrial-satellite manner. ERRATA is applicable to underground tunnels and mining environments at construction stage as well as to special storage facilities managing accidental or human-induced disasters. To demonstrate the usefulness of our solution we will demonstrate the developed system prototype in an operational environment, located at old mining sites. The demonstration will showcase the benefits of unmanned site inspection as a means of ensuring secure access to potentially hazardous spaces.