The Dolphin's Cry (Russian: Крик дельфина, romanized: Krik delfina) is a 1987 Soviet action drama film directed by Alexey Saltykov, based on the book by Nikolai Cherkashin "The Mystery of Archelon" "("The Dolphin's Cry").

[2][3][4] The crew of the new American strategic missile submarine "Archelon" is struck by an unknown virus.

The ship's psychologist observes the sailors are affected by barely restrained unmotivated aggression, and with every passing day it becomes more difficult for the captain to preserve at least the appearance of order.

Eventually, the captain can no longer withstand the prolonged torture of this strange disease; after unsuccessful attempts to board the ships enforcing quarantine of "Archelon", he fakes the destruction of his submarine and gives the order to sink the passing vessels.

At the last moment, the captain changes his mind and sends the boat into a vertical dive to the bottom of the ocean.