The penetration of light gases in Glacier Model of a uniform distribution of the gas in the lake under the glacier Diffusion of gas into ice L pen =sqrt(6D t LAKE ) L PEN - the depth of penetration of gas; D- gas diffusion coefficient; t LAKE - time of glacier location above the lake D H2 = 2*10 -8 m 2 /sec [1] D He =10 -9 m 2 /sec [2] The flow of the glacier H(м) 3770 3535 3270 3435 С H2 (lake) С He (lake) L PEN (D H2 ;t=40тыс.лет)=400 m L PEN (D He ;t=40тыс.лет)=93 m Depth concentration profile in the borehole 5G [1] H.L.