Sea Hunt 3x24 Rebreather

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.