Era*********

In the winter of 1978, a steam train bound for the northeastern forest area encountered a huge avalanche and fell into the no-man's land of the Greater Khingan Mountains. There are no mobile phones, no GPS positioning, and no jackets. The background is the undeveloped extreme cold virgin forest of the Daxinganling Mountains. There are snowstorms of minus 30 degrees Celsius, Siberian cold currents, hungry wolves and half-ton black bears (brown bears). There is no emphasis on seniority here, only the oldest law of the jungle - survival of the fittest.