Desc: Un tsunami sur le lac Léman: Directed by Laurent Graenicher. However, scientific research from the University of Geneva confirms the occurrence of a tsunami in the 6th century AD and suggests that it could happen again. What happened that day? What chain of events led to the disaster? This film investigates historians, archaeologists, geologists and physicists. Thanks to them, the legend has become a scientific fact. And it is now up to society to know how it intends to respond to this risk.