A strange intelligent organism is found at the bottom of the ocean. Once brought on Seaview the real threat the creature represents is realized. Suddenly every life on bo ...

While operating over the remains of a sunken 16th century pirate ship, the Seaview encounters a reincarnation of its dead captain. ...

The construction of an undersea canal is about to start with the Seaview tasked with placing the first charge, a 50 megaton nuclear bomb. But as it is being lowered an en ...

The Seaview is returning to the location of a sunken ship to recover its secret cargo. There are a number of other sunken ships in the area, and the thing responsible for ...

A meteor storm ignites atmospheric gases in the southern hemisphere. Adm. Nelson believes one of the Seaview's missiles can extinguish it but someone on board is secretly ...

The Seaview finds a sunken German U-boat while mapping the ocean floor. Sunk during WWI in the north Atlantic, it is now somehow in the south Pacific. Its captain boards ...

The Seaview rescues two men apparently lost at sea. They are actually escaped prisoners who try to take over the Seaview. The situation is complicated by the presence of ...

By air Nelson and Crane pursue a mysterious submarine stealing nuclear missiles. Their craft is shot down and Crane is captured. Nelson, recovered by a Navy destroyer, is ...

Admiral Nelson and Chief Starkey are marooned on an island with prehistoric creatures. The Seaview is trying to rescue them but they have an undersea monster of their own ...

In 1978, the first space probe to Saturn returns and the Seaview is sent to retrieve it. Despite their stringent decontamination procedures an alien life form survives an ...

Admiral Nelson is under pressure when a drone sub system he pioneered malfunctions and fires three missiles at New York City. The race is on to establish what went wrong ...

Word comes through that Dr Liscomb has been kidnapped by a foreign agent posing as a toy importer. Liscomb has cracked the secret of the X factor, a new ingredient and ev ...

A manned probe is returning to Earth when it is suddenly caught in the grip of a strange force and destroyed. Investigations point to a secret Chinese installation being ...

Nelson and the Seaview witness the detonation of a new bomb developed by the Chinese. No bigger than a milk carton it creates a blast 70 miles across. An American scienti ...

A research team are taking measurements of an underwater eruption. They discover a fissure that appears to lead all the way to the Earth's core. While the discovery is ex ...

The President of the United States is visiting a new underwater installation when a power interruption freezes all communication. To complicate the situation they discove ...

Admiral Nelson is contacted by a strange man claiming to be from the Office Of Naval Intelligence. He gives Nelson a cryptic message that Penfield is not to be allowed to ...

Captain Crane is in Venice to meet a secret agent when she is killed. It is believed she had knowledge of a new secret Soviet weapon, and how to combat it. Crane's missio ...

Nelson is visiting a scientist and discovers that he has created cyborgs, human looking robots. When Nelson tries to leave, the scientists orders his cyborgs to detain hi ...

A message is received from a US sub presumed sunk in the last months of WW2. The Seaview is sent to try and locate a cave that is mentioned in the message and to try and ...

The Chinese have developed a way to turn a human body into an intense bomb. They intend to infiltrate the Soviet Union and create a diplomatic incident that will draw the ...

Admiral Nelson and a Soviet scientist are in a diving bell when the vessel is swallowed by a giant whale. With only 90 minutes of oxygen, Captain Crane, Kowalski, and Ril ...

This episode involves the testing of a new air mixture that will allow a submarine to go to the bottom of the sea literally! A brash, news hogging, admiral and his aide, ...

Nelson is to meet a scientist working on a secret project at Loch Ness. When he arrives he discovers the scientist is dead. A series of strange events leads Nelson to bel ...

The Seaview is sent to investigate the wreck of the submarine Angler. They uncover evidence of strange behavior minutes before the loss, and Nelson sees this change in be ...

When a missile is destroyed by apparent ultrasonic sound, the Seaview investigates with Adams, the mentally unstable launch commander, on board and finds an giant manta r ...

The premier of the People's Republic, with some very valuable information, wants to defect to the US. The Seaview is sent to pick him up, but Nelson must first evaluate t ...

Admiral Nelson becomes involved in a project to develop an amphibian adaption for man. He encounters conflict with the two chief scientists, rather than being cautious, b ...

The Seaview is sent on a mission that will take into to some of the most dangerous waters in the world for submarines. Adding to the tension one of the officers lost an e ...

Crane is brainwashed to sabotage an important national defense mission which is being monitored by the national intelligence agency. ...

The Seaview is selected to be converted to a totally automatic ship controlled by a central computer. The mission goes well till Capt. Crane, the only person aboard the s ...

The Seaview is seized by a man calling himself the Buccaneer. As audacious as his plan is, it is only a small piece in a much larger plan. ...