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. ...

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 ...

The Seaview is on exercises when a series of signals are received indicating the USA is at war and they are to prepare for launch of all missiles. ...

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. ...

President Henry McNeil has fallen and seriously injured his head. That imperils an upcoming peace conference; even a whiff of the president's incapacity may doom it, as h ...

The assassination of a king means Prince Ang receives an early promotion. The new king is just a boy, and has a lot to learn about ruling. In fact, he has a lot to learn ...

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 ...

The Soviets have launched a rocket carrying a new satellite to be placed in orbit around the Earth. Everything is proceeding normally when they lose control of the rocket ...