The telefilm follows the fun adventures of two average students, Vovka and Valerka, who, while searching for an underground river, realize that their efforts won't succeed without knowledge.
| Actor | Role |
|---|---|
 Dima AndriyevskiВовка Веденеев | Вовка Веденеев |
 Сережа СкрибоВалентин Хрупалов | Валентин Хрупалов |
 Yevgeniya KhanayevaЛидия Павловна | Лидия Павловна |
 Taisiya LytvynenkoNot listed | Not listed |