en Cuevana 3. Sasha Kazarinov, an oil college student, is undergoing an internship at one of the drilling rigs in the northern taiga. At first, his relationship with drilling foreman Leushin did not work out. Leushin does not trust the city boy and does not put Sasha on the winch, although it is the topic of his thesis. But gradually, with his diligence, the intern wins the trust of the master.