The film tells about the scientific and human feat of lieutenant of the Russian fleet Dmitry Leonidovich Ovtsyn, the first explorer of the Ob tundra and the coast of the Arctic Ocean from the mouth of the Ob to the Yenisei. Landscapes of the Tyumen North. Gas pipeline construction. Seascape. Views of the city of Tobolsk, the Ob Bay, the Mansi taiga village, a camp in the tundra, the Yenisei River. Seal rookery, salmon spawning.