What happens
Patricia Gregory, Captain Tex Bradford and young Jerry Hall are prisoners on the artificial Magic Island of Euclydia, held on its ninth level by G-47 and his scientists. Patricia and Tex, searching for a way out, find that the steel doors of their room are actually mirrors, with only one panel a real door. They ride a silent elevator upward and step out onto a level where Joan Gregory and Jerry have already slipped aboard a Euclydian submarine. Joan, who has watched the commander operate the vessel, prepares to take it out, and the group must decide whether to trust her. The episode is part of the Magic Island series.
The artificial Magic Island of Euclydia, its steel rooms, elevators and submarine lock, under the ocean
Characters: Patricia Gregory, Captain Tex Bradford, Jerry Hall, Joan Gregory, G-47
Listen for: Joan's plan to take the submarine and the sound of the outer doors opening
Written from the episode itself; it never gives away the ending. Every recording is remastered for the stream: cleaned of rumble, hiss and mains hum (and the old TV whine where we found it), then levelled in two passes to steady broadcast loudness, so one show is never quieter than the next.