Around the World Under the Sea (1966)

All-star sixties cast of TV stars in a small submarine which takes on the task of embedding 50 special sensors in deep water around the world to warn scientists of impending earthquakes. This was tailor-made, it seems, for main man Lloyd Bridges, who was famous for the series Sea Hunt (1959-1961). His collection of specialists - several men and one woman (Shirley Eaton) - are hand-picked, but half of them have a thing for the female, so that creates the potential for complications. David McCallum plays a slightly shady scientist who cuts a deal to go on a salvage run after the mission is over, to get rich. Keenan Wynn is the grumpy older guy who actually lives in an undersea home. The method of anchoring the sensors is odd - it's done with explosives. Sci-fi elements of monster proportions intrude in the 2nd half, with the hints of large sea life manifesting itself as a giant eel, bigger than the sub. Pretty low budget, with a comfort factor of familiar faces.  BoG's Score: 5 out of 10

Star Trek TOS Actor Alert: in a small role in an early scene is Celeste Yarnall; she appeared in The Apple about a year later...
Under the Sea Trek Trivia: Bridges was said to be a front-runner for the Capt. Kirk role in Star Trek, ultimately played by William Shatner; there's an early scene in this film where-in McCallum's scientist demonstrates how he can instruct a dolphin to perform a task under a boat - this was later shown in a more detailed fashion in The Day of the Dolphin (73)