Soviet intelligence officer Kraft has a new assignment. This time, acting under the name of engineer Grubbe, he must find and transfer to the center the secret drawings of a new submarine codenamed "Walter".
| Actor | Role |
|---|---|
 Mikhail GolubovichВасилий Порик | Василий Порик |
 Olga LysenkoСтанислава Добжанская | Станислава Добжанская |
 Boris Kudryavtsevполковник Гресс | полковник Гресс |
 Yuriy DubrovinИван Васильевич, контрразведчик | Иван Васильевич, контрразведчик |
 Galina GalchenkoZhanna | Zhanna |