To better understand individuals’ behaviour in the face of a natural disaster, and to evaluate the preventive information provided by French local authorities, the theatrical performance “Safe and Sound?” (“Sain et Sauf ?”), and its accompanying debriefing session, was tested in six French Alps municipalities in 2019 and 2020 several 2-day sessions in collaboration with local authorities. 200 people took part in this theatrical performance and interviews. The “Safe and Sound?” scheme is based on a 15-minute play, followed by the collection of data from watching the play and debriefing with an interviewer, during about 30 minutes. Two scenarios on flood risks and on seismic risks were narrated by an actor introducing dilemma. Interviews were transcribed and analysed to determine the level and sources of knowledge about the two natural hazards, and the behaviour during a simulation with an actor. Most participants immediately headed to safety only to later put themselves in danger when confronted with an insistent neighbour and the introduction of emotion-provoking characters, i.e. children. When making their choice at each stimulus, participants evoke different sources of reason. A little under half of participants mention common sense or instinct. Although the majority of participants claim they received preventive information from local authorities, this information is rarely applied. The media and own experience were mentioned more often. Lastly, the “Safe and Sound?” campaign was designed to assess behaviour, but findings show that it was also useful to raise awareness among the population.