Some volcanic lakes in the Auvergne region of France are classified as meromictic, meaning their deep waters remain isolated from the surface water and have not mixed for thousands of years. These lakes, located in ancient volcanic craters, have a unique structure that creates a stable boundary between the deep and surface layers. At depths of around 92 meters, the water has been undisturbed for approximately six thousand years, accumulating dissolved gases such as carbon dioxide. This situation is similar to what occurred in Lake Nyos in Cameroon, where a sudden release of carbon dioxide in 1986 led to a limnic eruption, killing nearly 1,700 people. The deep water in these Auvergne lakes is under high pressure and cold conditions, which help trap the carbon dioxide, much like how carbon dioxide remains dissolved in a sealed bottle of soda. Over time, the volcanic bedrock beneath the lakes continues to release carbon dioxide into the deep water, increasing its concentration. Scientists have noted that these levels are comparable to those present in Lake Nyos before the disaster. The risk arises if something disturbs the deep water, such as an earthquake or landslide, potentially triggering a sudden release of gas that could form bubbles and cause a chain reaction. Unlike Lake Nyos, which now has artificial degassing systems in place to prevent a similar disaster, the Auvergne lakes lack equivalent monitoring systems. While local authorities and scientists have shown interest in tracking gas levels, the general public remains largely unaware of the potential dangers. The absence of monitoring infrastructure means that the risk, though not immediately obvious, could be significant if a triggering event were to occur. Researchers are working to raise awareness about these lakes and the potential hazards they pose. However, the lack of public knowledge and the absence of monitoring systems mean that the situation remains under-studied compared to other similar lakes around the world. Efforts are ongoing to assess the risks and determine whether similar measures to those in Cameroon could be implemented in Auvergne to ensure public safety.