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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.

Director : Alfredo B. Crevenna

Writer : José María Fernández Unsáin

Cast

José Elías Moreno

Carlos Cortés

Kitty de Hoyos

David Reynoso

Columba Domínguez

Javier Solís