What happens
Magic Island is the series, and this episode finds Jerry, Joan, Pat, Captain Bradford, Mrs. Gregory and Tex trapped deep in the Euclidean underwater city after the Euclidean submarine commander Elaine has been expelled and made their prisoner. An emergency halts all activity in the city, and the group learns that a flooded chamber is threatening everyone. Elaine proposes a plan to steal a rocket plane, using her uniform to pass the guards and taking the group's three former employees along. The party heads for an airlock in the crater wall, where they must put on diving helmets and wait for her plane. The episode ends with the group aboard the rocket plane, flying toward Los Angeles.
The Euclidean underwater city beneath a volcanic island, its steel corridors, the airlock in the crater wall, and a rocket plane heading for Los Angeles
Characters: Jerry, Joan, Elaine, Captain Bradford, Mrs. Gregory, Tex, Pat, McLeod
Listen for: The alarm strokes that reveal chamber twelve is flooding, and Elaine's plan to steal a rocket plane to escape.
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.