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Sea Hunt is an American action adventure television series 
that aired in syndication from 1958 to 1961 and was popular 
for decades afterwards. The series originally aired for four
 seasons, with 155 episodes produced. It stars Lloyd Bridges
 as former Navy diver Mike Nelson, and was produced by Ivan 
Tors.
Mike Nelson (Lloyd Bridges) is a free-lance scuba diver, 
a former Navy frogman who left the service about four years
 before the series begins. He is a well-known expert on diving
 who is often called on for difficult or dangerous projects. 
He travels on his boat the Argonaut and outmaneuvers villains,
 salvages everything from a bicycle to a nuclear missile,
 rescues children trapped in a flooded cave, and other such 
adventures. In the pilot episode, he rescues a Navy pilot
 from his sunken jet. No dialogue was possible during the underwater
 sequences, so Bridges provided voice-over narration for all the
 installments. Nelson also educated non-diving characters in
 various aspects of diving and the underwater world.
The series made frequent references to Marineland of the 
Pacific, which provided facilities, resources, and technical 
advice to the production company. At the end of each episode,
 Bridges would appear as himself to deliver a brief comment. 
These comments sometimes included a plea to viewers to 
understand and protect the marine environment, along with 
gems of wisdom from Bridges' own experiences. The series served
 as a stepping stone for some notable actors, including 
Leonard Nimoy, Bruce Dern, Robert Conrad, Ross Martin, Robert 
Clarke, Larry Hagman, Larry Pennell, Ken Curtis, Jack Nicholson, 
and Bridges' own sons Beau and Jeff.