What happens
Superman, disguised as Clark Kent, joins Lois Lane, Harry White, Jimmy Olsen and Dr. Cameron on an expedition to find the lost continent of Atlantis, aboard Dr. Cameron's submarine. A German U-boat surfaces and its commander takes control of the expedition, insisting it now serves the German government. A tense confrontation follows aboard the submarine, and Jimmy Olsen is badly injured. The episode is part four of the serial The Adventures of Superman, first aired on 1942-12-15.
Aboard Dr. Cameron's multi-depth submarine on the Atlantic Ocean, and then aboard a German U-boat.
Characters: Superman, Clark Kent, Lois Lane, Harry White, Jimmy Olsen, Dr. Cameron, Commander
Listen for: The German commander's announcement that the expedition now serves the German government, and Superman's rescue of the stricken submarine.
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.