Pavlova, Tristan, Henry and the boy Mikko find a city built by a mysterious ancient civilization at the bottom of the ocean. The discovery of the wonders of the underwater city and meeting with an embrasure terrorist make up the plot of the film.
| Actor | Role |
|---|---|
 Tatyana Dogileva(voice) | (voice) |
 Semyon Farada(voice) | (voice) |
 Efim Katsirov(voice) | (voice) |
 Ekaterina Krasnobaeva(voice) | (voice) |
 Vasiliy Livanov(voice) | (voice) |
 Lev Shabarin(voice) | (voice) |
 Evgeniy Steblov(voice) | (voice) |