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. ...

The Seaview is tasked with recovering a returned deep space probe. On board the probe is a robot as sophisticated as a man, and capable of experiencing everything a human ...

An undersea earthquake exhumes hundreds of strange metallic capsules, and a powerful humanoid creature who could destroy mankind is restored to life after millions of yea ...

Admiral Nelson is aboard a new submarine when it is destroyed by a giant jellyfish. Nelson and the first officer are the only survivors. The two men begin a desperate bat ...

Admiral Nelson is kidnapped by a group of Nazis trying to re-establish the Reich after WW2. They want Nelson to be in charge of their underwater projects. ...

Whale specialist Walter Bryce has taken his family to sea in pursuit of the largest living creature ever to exist, an immense whale twice the size of the previously known ...

Winter in summer? Snow has struck the United States as far south as Florida, and Nelson knows why: somehow, the Gulf Stream has shifted east, permitting colder temperatur ...

A very important Soviet official is defecting to the USA with his daughter. They are scheduled to be picked up in Indonesia by the Seaview. On the last leg of their escap ...

Seaview is called on to investigate the mysterious crashes of several U-2 spy planes. They discover the cause is a magnetic beam of immense power. Then they discover that ...

Chip Morton and Curley Jones are in New London making repairs on the diving bell's guidance system. At the same time a skirmish in the control room of the Seaview sails d ...

A U. F. O. has been spotted flying around the United States, terrifying people and violating every airspace regulation in the book. It falls into the sea, which, after an ...

A scientist on a research facility in Antarctica discovers a new form of sea plankton that turns monstrously large and aggressive if exposed to heat. After the scientist ...

In exactly eleven days there will be a terrible polar earthquake. The resulting tidal wave could destroy civilization. The Seaview is dispatched for damage control. Certa ...