Mount Vesuvius is continuously kept under surveillance by the Vesuvius Observatory of the National Institute of Geophysics and Volcanology. When an appointed set of geologic activities occurs, an eruption warning is issued and the evacuation procedure begins. It has been estimated that 72 hours are needed to complete the evacuation: 12 hours to organize it, 48 hours to transfer all the people outside the red zone and 12 hours are kept as a safety margin for unexpected events.