On cosmic picture of the ice surface lake Baikal are discovered dark ring by diameter 7 km-8 km. The author shall give physical interpretation given phenomenon, having expected that shaping rings are connected with surge of the warm natural gas from sedimentary thick mass of the bottom of the Baikal. Convection is formed in thick mass of water in the manner of torah around surge of the natural gas, which carries become warm water before surface (the lower edge ice) in side from pole of the natural gas. The mechanism heatconductivity heat gets to upper edge ice, where snow and ice begin intensive to melt. As a result thawed patch is formed on snowclad ice in the manner of ring.