Mr For big ice already has millions of years of history, extends to the mountains 80 km deep. The thickness of ice is increasing every year. Tip now has 8 meters, nearly twice as much as one hundred years ago. Large ice is cold, from the hole to hole about 50 minutes, all the visitors should pay attention to keep warm, at the age of snow here, forming the shape of the various like stalactites, very beautiful and strange.