What happens
Captain Bradford, Mrs. Gregory, Jerry and Joan are aboard the Gregory yacht, which has been drawn into a submarine lock beneath the artificial Isle of Euclidea as the island sinks beneath the sea. G-47 has let a battle fleet approach the island so that Captain Bradford's pigeon, carrying the formula, can reach Johnson's boat. Captain Bradford and Joan are taken away by G-47, and Jerry tries to repair the yacht's damaged radio. Johnson's boat calls in, and the yacht's crew discovers the dropped anchor chain may now serve as an aerial.
The artificial Isle of Euclidea, sinking beneath the ocean, and the submarine lock where the Gregory yacht is trapped, with a battle fleet maneuvering overhead.
Characters: Captain Bradford, Mrs. Gregory, Jerry, Joan, G-47, Tex, Johnson
Listen for: Johnson's transmission over the radio and the crew's discovery that the anchor chain may serve as an aerial.
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.