Venturing onto the frozen surface of a lake, like Lake Servières in the Puy-de-Dôme department, is never safe and requires some preliminary precautions. One must first dress warmly against the cold but also avoid going alone and remember to bring an ice pick. It would help to get out of the freezing water in case of a fall. For this eventuality, a waterproof bag with a change of clothes also helps reduce the risk of hypothermia.