When a unit of Colombian soldiers enter a remote bunker they discover that all is not well. While the military base has been out of contact, all those inside have been massacred and their blood daubed on the walls. Exploring the carnage, the troops discover a woman guerrilla suspect who has somehow escaped the orgy of violence. Confused and isolated, the soldiers find themselves gripped by inexplicable feelings of fear, mistrust and paranoia. Claustrophobic horror-thriller from South America.