Sea Hunt (1958)

The State Department dispatches Mike to South America for a crucial rescue mission. He must penetrate a complex system of heavily-guarded canals to free an imprisoned newspaper editor from a ruthless dictator's fortress.

Hired by a swimsuit designer for an underwater fashion shoot, Mike's routine assignment takes an unexpected turn when he discovers dangerous corporate espionage threatening the project.

In a daring attempt to strike at organized crime, Mike Nelson takes on a perilous mission to photograph a secret meeting of top racket bosses at a crime czar's lakeside estate, using an ingenious underwater periscope camera.

On a government assignment, Mike Nelson discovers dangerous radiation emanating from a foreign freighter. When official inspections find nothing, he realizes he's facing a sophisticated sabotage operation.

Off Miami's coast, Mike Nelson investigates a sophisticated espionage operation where divers are using underwater caves for secret microfilm exchanges. Working with the Coast Guard, he must stop this threat to national security.

When a sunken ship in a harbor channel shows alarming radioactivity levels, Mike Nelson must locate and secure a dangerous capsule. The situation becomes critical when his assistant collapses, leaving Mike to complete the perilous task alone.

Mike Nelson teams up with Secret Service agent Nancy Stewart to recover $2 million in Nazi counterfeit currency from a sunken WWII plane in the Caribbean, while battling local threats.

A malfunctioning TV monitor during a missile test alerts Mike Nelson to potential sabotage. He discovers an underwater spy station and must confront foreign agents to safeguard the critical operation.

What starts as a routine geological survey turns dangerous when Mike Nelson helps a gemologist trace a jade statue's origins. Their search leads them to a remote island where betrayal awaits beneath the waves.

During a Coast Guard Auxiliary patrol, Mike Nelson stumbles upon a deported gangster attempting to re-enter the country illegally. After a daring rescue from would-be killers, Mike faces betrayal and mortal danger.

Mike Nelson's salvage job takes an unexpected turn when he uncovers a scheme to steal over a million dollars worth of gems from a sunken ship's safe. He must use all his skills to thwart the robbery.

During a routine security check for a visiting foreign leader, Mike Nelson's underwater exploration reveals more than a corroded boiler. He uncovers a concealed atomic explosive, triggering a desperate deep-sea fight for survival.

After a successful revolution, Mike Nelson aids the new leader in searching for their country's missing gold reserves aboard a sunken freighter. The mission becomes complicated when he must identify enemy agents.

While marking underwater demolition sites, Mike Nelson learns that twelve-year-old Joey Turner is trapped in a submerged grotto rigged with a timed explosive. He must locate and disarm it before time runs out.

Mike Nelson leads a risky deep-sea expedition to capture a living fossil - the rare coelacanth. The hunt involves dangerous depths and puts both Mike and the expedition organizer in extreme peril.

During a scientific expedition mapping the ocean floor, Mike Nelson's warnings about excessive explosive charges go unheeded. When the first blast triggers dangerous upheavals, he races to prevent a potential tidal wave.

Mike Nelson ventures into ancient Mayan lands seeking Tlalcaytal, a powerful drug with medical potential hidden in a sacred ceremonial pool. His quest becomes a fight for survival against hostile attackers and deadly wildlife.

Six-year-old Cindy is trapped in a mine's flooded air shaft at the edge of a man-made lake. When Mike Nelson's first rescue attempt is threatened by an impending landslide, he searches for another way to reach her.

When oceanographer Sherry Bishop goes missing at sea, Mike Nelson discovers her research charts and deduces she followed an ocean current. His search through treacherous waters leads to a remote island.

While surveying a harbor floor, Mike Nelson finds a mysteriously vanished Navy LST. As he investigates with two survivors, dangerous accidents suggest someone harbors dark secrets about the ship's disappearance.

Hired to salvage a box from a sunken galleon, Mike Nelson discovers it contains a priceless Cellini vase. His suspicions about the museum director's motives lead him into dangerous waters.

While checking cables in Lake Ontario, Mike Nelson hears a tremendous roar. The Coast Guard gives him just thirty minutes to identify a potential enemy missile before it becomes an international incident.

During underwater experiments with infrared light, oceanographer Dr. Singh disappears. Mike Nelson and Swedish assistant Rise Helveg's search leads to breakthrough discoveries in underwater detection.

Mike Nelson and Pete Rogers take on a hazardous mission to gather intelligence about a secret missile-launching site, using experimental rebreathers to avoid detection. When one device fails, survival becomes the priority.