What happens
Jerry Hall and Joan Gregory, prisoners in the Euclidean city beneath the sea in the Magic Island series, wander its vast caves with Joan's mother and Captain Bradford's mission in mind. Their tour leads them through a steel wall into a sector of submarine and airplane commanders, where they are unexpectedly met by a Euclidean commander. He warns them they must leave, then offers a route back by way of the agricultural chamber. Jerry and Joan learn that their captain has been taken to the transportation laboratory, where Euclidean vehicles are displayed. The commander then tells them that homing pigeons may be found there, and he urges them to keep quiet about it.
The underwater Euclidean city, built in natural caves beneath the ocean, including a transportation sector and an agricultural chamber
Characters: Jerry Hall, Joan Gregory, Captain Bradford, Mrs. Gregory, G-47, Euclidean commander
Listen for: The commander's unexpected revelation about the homing pigeons in the transportation laboratory
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.