After a young man is killed in an unexplored subterranean cavern and his girlfriend driven mad by something she saw there, a track found at the scene cannot be identified with any known animal and thus a scientific expedition is launched to find out just what it is that is living there.
Length 78 minutes
José Elías Moreno | Carlos Cortés | Kitty de Hoyos | David Reynoso | Columba Domínguez | Javier Solís | Carmen Molina | Ramón Bugarini | Carlos Nieto | Marco Antonio Arzate | Armando Acosta | Roberto Meyer | Inés Murillo | Miguel Suárez