Lake Baikal, located in Siberia, is the world's deepest and oldest freshwater lake. One of its fascinating features is the presence of methane bubbles trapped under its ice during the winter months. These bubbles form when organic matter at the bottom of the lake decomposes and releases methane gas. As the gas rises to the surface, it gets trapped under the thick ice, creating a striking visual effect. These methane bubbles are not only a unique natural wonder but also an important subject of study for scientists monitoring greenhouse gas emissions and climate change.