Reparto y equipo
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John CarradineProf. Millard Wyman
Joe MaierhauserJim Wyman
Phyllis CoatesDale MarshallMaurice BernardOld Man in the CavernsHarry RavenThe CaptainGeorge SkaffDr. J.R. Matheny
Robert ClarkeCraig Randall
Lloyd NelsonWilson - Sonar ManAllen WindsorPaul WhitmoreJerry WarrenPlane Passenger Behind Wyman(uncredited)Lowell HopkinsReporterJack HaffnerJimmy - Reporter