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This prison drama is taken from the play by Eduardo Corbe. The title refers to the term used by Fidel Castro to describe his political opponents (English translation -- "worms"). A sadistic inquisitor is relentless in his grilling of three men and two women who are captured in the Cuban jungle. Captain Morena (Mario Pena) is the pro-Castro military officer who is caught between party loyalty and what he believes is unfair treatment of the prisoners. He is torn between wanting to impress visiting Soviet officials and determining the fate of the captives. The first version of this film came out in 1977, but the prints were stolen and subsequently damaged. Restored prints were used in the new version, much of which had to be redone due to the extensive damage obviously orchestrated by minions loyal to Castro.