Large shipyards for gigantic cruise ships require a special attention to safety due to the huge number of workers involved and to the complex structure of spaces. A critical issue of such environments is to keep the environment under control to avoid a disordered evacuation in case of an emergency. After introducing the basic issues related to safety in shipyards, we discuss the design of an information system for checking the shipyard safety status, supporting synthetic information visualization techniques about escape routes and dynamic evacuation plans. We discuss also the problems of communicating with workers in case of evacuation using visual cues to signal the correct escape routes.