What happens
Mrs. Gregory, her daughter Joan, Jerry Hall and Captain Bradford are held in the underwater city of Euclidea, four hundred feet below the surface, after Joan was found on the hidden island. Having escaped the island, they now face a harder problem: no obvious way out. They eat lunch in their quarters, marvel at the city's artificial light and food, and discuss their situation. Captain Bradford reports that he spoke with G47, who asked him to help design a new submarine and promised to show him the rocket ships. The group agrees to keep learning about the city and to look for a means of escape.
The underwater city of Euclidea, four hundred feet below the ocean surface, beneath a hidden artificial island in a volcanic crater.
Characters: Mrs. Gregory, Joan, Jerry Hall, Captain Bradford, G47
Listen for: Captain Bradford's report of his talk with G47 and the mention of rocket ships that might offer a way out.
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.