As the early days of SCUBA diving opened up a new world, Sea Hunt portrayed diverse underwater adventures. Mike Nelson (played by Lloyd Bridges) is in the Coast Guard Auxiliary, and although this does not play into most episodes, it supports his diving expertise through training in and work with the Coast Guard and Navy which includes demolition. Mike finds himself in adventures that include performing rescues, solving mysteries, conducting undersea exploration and scientific experiments, testing new technologies, fighting crime, and locating anything from sunken ships to satellites and spacecraft. Sometimes, he is just in the wrong place at the wrong time, and we experience him resolving the situation and getting himself out of a predicament. Voice-overs help viewers understand what in taking place in the silence of the deep and to gain from his knowledge as he also explains his thoughts to educate us in and entice us to go into the fascinating world he visits in each episode.
Several episodes feature Lloyd Bridges real-life young sons Beau and Jeff Bridges, as well as other soon-to-be stars early in their career.
