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After training at the dolphin reconnaissance school, the dolphin Tristan was sent on an important mission to a secret military base of the USSR to obtain information about the Russians' new strategic weapon - a submarine that transforms into an airplane. After receiving a message that an unidentified object was discovered in Soviet territorial waters, moving towards a secret base, the Soviet command ordered to urgently send an experienced special agent, the dolphin Isolde, to intercept it.

Director : Rasa Strautmane, Aleksandr Mazaev, Vladimir Tarasov, Aleksandr Gorlenko, Elena Prorokova

Writer : Eduard Uspensky

Cast

Vasiliy Livanov

Tatyana Dogileva

Boris Bystrov

Semyon Farada

Vsevolod Abdulov

Lyudmila Gnilova