北极的冰雪覆盖大地，极光照亮夜空，展现出神秘而美丽的自然奇观。成年在线

　　The beginning of the 1960s, a period of aggravation of the confrontation between the USSR and the USA. In the most difficult weather conditions and with malfunctions on board, the first Soviet nuclear submarine K-3 sets off for a hike under the ice of the Arctic Ocean in order to surface exactly at the North Pole.