1955
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- OverviewFeb 8-Oct 4, 195835 episodesEpisodes39. Manganese Story Oct 4, 1958
- A geologist discovers a vital metal on the sea floor.
- 38. The Sea Has Ears Sep 27, 1958
- Two divers kill an inspector of underwater telephone cables.
- 37. Decoy Sep 20, 1958
- Mike searches for a sea monster.
- 36. Lord Christobal Sep 13, 1958
- Mike investigates the mysterious sinking of a freighter in the West Indies.
- 35. The Amphibian Sep 6, 1958
- Mike captures an underwater espionage agent.
- 34. Explosion Aug 30, 1958
- Mike must destroy an underwater peak that has torn the hulls of many ships.
- 33. Dead Man's Cove Aug 23, 1958
- Mike tries to prove that a woman's drowning was not accidental.
- 32. The Birthday Present Aug 16, 1958
- Hoodlums attack Mike after he explores the waters around a pier.
- 31. The Big Dive Aug 9, 1958
- A stuntman tries to break the world's skin-diving record.
- 30. The Shipwreck Aug 2, 1958
- An unexpected storm capsizes a boat.
- 29. Capture of the Santa Rosa Jul 26, 1958
- A diplomat and his family are kidnapped.
- 28. The Lost Ones Jul 19, 1958
- Rising tides trap two children in an undersea cave.
- 27. Underwater Station Jul 12, 1958
- Enemy agents imprison a missile expert in a strange chamber deep in the ocean.
- 26. The Hero Jul 5, 1958
- Mike must prevent a diving trip from ending in disaster.
- 25. The Prospectors Jun 28, 1958
- Two greedy prospectors search for an underwater uranium deposit.
- 24. Pressure Suit Jun 21, 1958
- A professor and his daughter search for a rare underwater plant in Costa Rica.
- 23. Legend of the Mermaid Jun 14, 1958
- Mike investigates stories of a beautiful mermaid that leads men to their deaths.
- 22. Underwater Patrol Jun 7, 1958
- Mike searches for an underwater thief.
- 21. Magnetic Mine May 31, 1958
- A live naval mine drifts into a harbor, endangering town citizens.
- 20. Alligator Story May 24, 1958
- An alligator takes refuge in a public park.
- 19. Diamond River May 17, 1958
- Death hangs over a South American diamond-diving expedition.
- 18. The Sponge Divers May 10, 1958
- Mike faces another challenge after he saves a diver whose air line is tangled on jagged rocks.
- 17. Girl in the Trunk May 3, 1958
- A magician is trapped in a trunk at the bottom of the sea when her escape act fails.
- 16. The Poacher Apr 26, 1958
- A poacher uses massive electrical charges to kill Everglades fish.
- 15. Continental Rift Apr 19, 1958
- A man's treasure locator is a stolen Navy secret device.
- 14. Hardhat Apr 12, 1958
- Nelson defies rivals to recover a German U-boat, sunk off the South American coast.
- 13. The Shark Cage Apr 5, 1958
- A jealous filmmaker severs a shark-cage cable, trapping Nelson.
- 12. Midget Submarine Mar 29, 1958
- Communist agents kidnap a defector.
- 11. Killer Whale Mar 22, 1958
- A killer whale terrorizes the sea coast.
- 10. Recovery Mar 15, 1958
- Nelson races enemy agents for a top-secret rocket nose-cone.