Sea Hunt (1958)

Mike Nelson attempts a three-day underwater experiment in a SCUBASPHERE at 250-foot depth. When a storm damages the sphere and snaps the cable to his support ship, he becomes trapped in the darkness.

During a remote river survey, Mike Nelson encounters Tom and Jill Marzec, emerald prospectors. Tom's jealousy leads to violent confrontations, while Jill seeks Mike's help, complicating the situation with romantic implications.

After ships collide due to jammed radar, Mike Nelson finds a booby-trapped electronic device in an old ship's boiler underwater. He races to disarm a bomb and battles enemy divers to preserve crucial evidence.

Renowned journalist Fred Darrell, thinking he has a fatal illness, tries to stage his suicide as a diving accident with Mike Nelson as witness. When Mike learns the diagnosis was wrong, he must race to save the misguided newsman.

When a ballerina's foot becomes trapped in a sunken freighter, Mike Nelson faces a race against time. He must find a way to free her without resorting to amputation, preserving both her life and her career.

After being caught in a fishing net, Mike Nelson learns of Dr. Sperling's medical settlement's crisis. He offers to recover vital supplies dumped in a river by a dictator, facing booby-traps and enemy divers before confronting the warlord.

Mike Nelson's plan to blow up a navigation hazard turns into a desperate rescue when his friend and fiancée get trapped while searching for rumored treasure in the doomed ship.

After clearing a path through a heavily mined harbor for medical supplies, Mike Nelson faces a new challenge when a patrol boat prevents the delivery. He undertakes a risky underwater mission to ensure the vital supplies reach their destination.

Mike Nelson faces a critical mission to retrieve radioactive cylinders lost at sea. The task is complicated by Chan Harrington, a reckless assistant whose actions endanger the team and expose Mike to radiation.

Mike Nelson stumbles upon a complex underwater drug smuggling operation. Using sonar technology, he tracks the smugglers, leading to a fierce battle and a daring plan to infiltrate their hideout.

While searching for fossils, Mike Nelson befriends a young Mexican boy dreaming of finding secret messages in bottles. The child reveals a hidden entrance to an underwater cave, aiding Mike's expedition and forging an unlikely friendship.

While training female astronaut candidates, Mike Nelson faces a crisis when a panicked trainee gets trapped underwater. He must rescue her and another frightened candidate while fending off circling sharks.

Off a Caribbean island, Mike Nelson finds a crashed Nazi warplane from World War II. Hired to salvage a survival kit containing an experimental drug, he uncovers a dangerous secret involving a surviving Gestapo pilot.

Hired to investigate claims about a treasure-filled underwater cave, Mike Nelson discovers the site has been deliberately staged. His revelation triggers a desperate attempt on his life as thieves try to escape with stolen funds.

Mike Nelson works with a reluctant scientist to finish her late father's revolutionary underwater detection device. Her bitterness over her father's death threatens the project until a near-fatal incident changes everything.

After refusing to continue lessons with an incompetent diving student, Mike Nelson receives suspicious bribes and requests to reconsider. His investigation reveals an elaborate espionage scheme involving a defector.

When mysterious explosives are discovered underwater, Mike Nelson leads an international team to disarm and identify them. After his teammates are injured, Mike's efforts help transform old adversaries into new friends.

During a quest to capture poisonous lion fish in Hawaii, Mike Nelson must manage a rebellious youth and a hostile college student. Their encounters with the deadly fish lead to valuable life lessons.

When a Korean War hero joins Mike Nelson to recover crucial rocket components, his courage at high altitudes doesn't translate underwater. Panic leads to decompression sickness and claustrophobia, challenging Mike to save his life.

After a diver dies mysteriously in a tropical lagoon, Mike Nelson teams up with a marine biologist and photographer to investigate legends of a sea monster. Their search leads to a terrifying underwater battle.

While exploring a sunken yacht off Yucatan's coast, Mike Nelson battles both natural dangers and human intrigue. After one diver disappears in underwater quicksand, Mike races to save others from the same fate.

Mike Nelson investigates strange activity on an uncharted Pacific atoll, finding both an escaped Mexican prisoner and mysterious divers. He teams up with the escapee to uncover a dangerous international operation.

At a remote missionary outpost in Ecuador, Mike Nelson attempts to transport a critically ill infant to a hospital. Blocked by hostile Jivaro Indians, he creates an underwater capsule to smuggle the baby to safety.

Under cover as a tourist, Mike Nelson investigates reports of illegal missile launchers near U.S. territory. His covert underwater photography mission is complicated by suspicious frogmen and an intrusive journalist.