Sea Hunt follows the adventures of scuba diver Mike Nelson, an ex-Navy frogman, played by Lloyd Bridges. He outmaneuvered villains, salvaged everything from a bicycle to a nuclear missile, and rescued a downed Air Force pilot (in his sunken jet, in the pilot episode), children trapped in a flooded cave, and even a dog. One unusual aspect of the series was that at the end of each episode, Bridges made a plea to protect the oceans.
After Bridges was cast, he was given a crash course on scuba diving by Zale Parry, and Courtney Brown, the latter would serve as his underwater stunt double. Over the course of the show’s run, Bridges would get more involved in the underwater stunt work, graduating from close-ups in the earliest episodes, to doing all but the most dangerous stunts by the end of the series’ run.
Episodes on YouTube:

This is great! I remember watching Sea Hunt every night between 6 & 7 pm with my Dad. He’s been dead 18 years now. How refreshing to see the series once more. The writing and the show was full of hope… something missing in today’s television.