An avalanche from winter. The avalanche fall on the river in the forest. The river waters pierced the bottom of the avalanche. Then a natural bridge and tunnel formed. Snow covered with soil, broken branches and leaf fragments. Snow and ice looks dirty. Snowslip, snowslide. This is an old avalanche and still has not melted. Aerial flying footage with drone. 4K UHD 3840×2160 30p.