Earth has been abandoned for a long time and humanity has found refuge in outer space. Three archaeologists return to Earth to investigate the origin of a mysterious five tone signal… Earth has been abandoned for a long time and humanity has found refuge in outer space. Three archaeologists return to Earth to investigate the origin of a mysterious five tone signal… Earth has been abandoned for a long time and humanity has found refuge in outer space. Three archaeologists return to Earth to investigate the origin of a mysterious five tone signal… Earth has been abandoned for a long time and humanity has found refuge in outer space. Three archaeologists return to Earth to investigate the origin of a mysterious five tone signal…