Mike and Jennifer try to salvage drums of toxic waste from the ocean depths.

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A man (Donnelly Rhodes) hires Mike (Ron Ely) to teach his paralyzed wife scuba diving---only to fire him when the therapy begins to show results.

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When Mike (Ron Ely) is hired to study the proposed site of an underwater park, his life is threatened by men who are illegally mining the mineral-rich area.

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The Nelsons investigate a marina construction company that is setting off explosions that are disturbing an underwater volcano.

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A federal agent, William Taylor, hires Mike (Ron Ely) to collect evidence on a crime boss plotting a drug scam.

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The Nelsons help a pearl farmer (Lisa Lau) catch the thieves who've been stealing from her each year at harvest time.

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Mike confronts his worst nightmare when an old friend and an old enemy come back into his life to threaten Jenny.

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When Jenny meets an acquaintance of Mike's, treasures of the sea and of the heart are in the balance, which causes Mike some measure of concern.

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While scuba diving, the Nelsons discover the wreckage of a plane---which involves them in a plot to steal computer software.

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A magic trick turns deadly when Mike (Ron Ely) makes the acquaintance of a temperamental illusionist who's trying to perfect his underwater escape act.

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Drug smugglers force Mike at gunpoint to help them retrieve a sunken shipment of narcotics.

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Jenny and Mike look into the peculiar behavior of two ecologists — and find a deadly underwater mine in the process.

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When Jennifer fails to return from working on a research project in the Caribbean, Mike (Ron Ely) risks his own life to search for her.

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A best-selling adventure writer lady challenges Mike to a scuba race.

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Mike becomes suspicious of a woman's motives for taking diving lessons when he learns that she's afraid of deep water.

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Mike becomes suspicious of a woman's motives for taking diving lessons when he learns that she's afraid of deep water.

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Mike learns that the two men who chartered the Sea Hunt to go scuba diving are really seeking safety from hit men.

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Two brothers (Terence Kelly, Denis Blouin) charter the Sea Hunt for a diving expedition, hoping to discover where the previous owner of the boat hid stolen treasure.

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Mike (Ron Ely) is hired by a professor at the Marine Institute to search for fossils and runs up against two young thugs intent on finding the fossils before him. Kimber Sissons. Bernardo, a young Mexican boy helps Mike locate a safe entrance to an underwater fossil cave.

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Mike comes to the aid of his former diving instructor, a cantankerous old man (Barney O'Sullivan) on the trail of sunken treasure.

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Mike and Jennifer rescue two injured divers, who later claim to have seen a beautiful woman underwater and heard bells ringing.

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The Phantom is a submarine fitted with a camera. Through the powerful underwater video camera, Mike (Ron Ely) watches two men hide something near a coral reef and his further investigations lead him to a spy ring.

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