Unknown World (1951) - Unknown World (1951) - DVD

Several scientists band together to form "The Society to Save Civilization" to plan to find a safe place for humanity to continue in the event of global thermonuclear war. They are able to employ the use of a cyclotram, a ship which can withstand the heat and pressure inside the Earth to attempt to locate a livable cavern in this sci-fi adventure with danger aplenty and discoveries anew.