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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.
Release: Sep 02, 1965
Runtime: 85 minutes
Language: Español
Studio: Producciones Sotomayor
Country: Mexico