The model and interior sets of the submarine cost producer Irwin Allen $400,000, so he was naturally quite keen to get some further use out of them. Since the film was a hit, he was able to convince ABC-TV to turn it into a series, which became the longest-running one he ever had.

Barbara Eden (Cathy) and Micheal Ansara (Miguel) were married at the time this film was made.

Director's Trademark: The voice-over for the newscasts that crew members watch, detailing the burning forests, etc., is done by director Irwin Allen.

Some of the sub's equipment and sound effects were recycled from The Fly (1958).

It appears that the internal support structure of the observation nose of the submarine Seaview may have come from the set of "The Phantom Planet (1961) lunar base set's internal metal structural supports as the closely resemble one another. Since both films were released in the same year (1961) and knowing Irwin Allen's talent for recycling movie and television sets, it's not unreasonable that Allen's production at 20th Century Fox was able to obtain and use these set pieces once production wrapped on "The Phantom Planet".

This is only a personal observation and theory. If anyone has documentation to support or dispute this theory, it is welcomed! Thanks.

Walter Pidgeon, who played Admiral Nelson in the movie, and Richard Basehart, who played Admiral Nelson in the TV series based on it (Voyage to the Bottom of the Sea (1964)) both died within a week of each other.

Although the "Seaview" is made believable in the film, a large glass nosed submarine is not possible even with modern day technology. Additionally, no modern sub of that size can withstand the pressure of the Marianas trench.

Robert Easton who played "Sparks" the radio operator on the Seaview also was the voice of Lieutenant George Lee 'Phones' Sheridan in Stingray another underwater vessel.

When the bomb is released - it results in the sound that the batmobile makes when it powers up.

The design of the "Seaview" model took full advantage of hydrodynamics. In the the underwater scenes, it was simply pushed into frame by an off camera diver and allowed to glide freely by itself. This made the scenes quite realistic, although in one it can be seen losing momentum and arcing downward a tiny bit just as the scene cuts. In surface scenes, it was pulled by thin wires.

On a Congressional tour of the submarine "Seaview", Admiral Nelson mentions that there are things on the sub that even Jules Verne had not imagined. The next person they meet is Commodore Lucius Emery, played by Peter Lorre, who was Prof. Pierre Arronax's assistant Conseil on the Walt Disney version of the Verne classic (20,000 Leagues Under the Sea (1954)), about a 19th-century submarine.

Del Monroe appeared in the original film as Kowski as well as the TV series as a character with similar name Kowalski.

The tail fins of the "Seaview" resemble the those of a 1961 Cadillac. In the series' first season, stock footage of "Seaview" from this film was mixed with some new footage of a slightly altered model. The movie version has running lights on the tips of the tail fins. However, the model in the in newer footage has none. Additionally, the searchlight on her bow (which played an integral part in one of the film's best underwater action scenes) became a laser.

During the "Seaview's" first dive, a sound effect from "War Of The Worlds" is used in the main control room. It is the sound of a Martian War Machine powering up its heat ray.

Michael Ansara would go on to become an iconic figure in the "Star Trek" franchise. He played Klingon Cruiser Captain Kang in the original series episode "Day Of The Dove", the "Star Trek: Deep Space Nine" episode "Blood Oath" and the "Star Trek: Voyager" episode "Flashback".

The scene in which the Seaview navigates a field of sinking icebergs is physically impossible. Ice is less dense than water, and always floats. Were this not so, the Earth's oceans would long ago have frozen solid.

Henry Daniell plays Dr Zucco in this movie. Both he and George Zucco played Prof Moriaty in the Sherlock Holmes movies.

First came out on DVD in 2013, Ironically both Michael Ansara and Joan Fontaine passed away in the year.

Sub hunting Seaview is Skipjack class attack sub.

Michael Ansara and Barbara Eden were married to each other when this movie was made.

Michael Ansara returned to the series along with Del Monroe who also played Seaman Kowski in the 1961 film. While Monroe had a steady role in the series, Ansara only played in one show in which he played Captain Tomas Ruiz.

The Control Room is forward of the Sail, thus the periscope is video feed to the actual periscope in the Sail, mounted aft of the Control Room for both movie & TV Seaviews.

"Seaview's" glass nose was originally to be two-stories but budgetary restraints didn't allow for it. In the TV series' second season, the model was altered to have two large forward view ports rather than the eight small ones on the movie and first season version. The second story of the nose wasn't actually constructed but a new hatch in the floor indicated that the second story was the Flying Sub bay. The underside of the nose was also quite different. It featured a new bulge with huge hangar-like doors for launching the Flying Sub.

O Nose glass was called Herculite.

After the water-leaks from the exploding mines in front of the Seaview are under control, you can clearly see a pack of Winston cigarettes in the water-soaked pocket of Captain Crane. During the films era, Winston was the most popular cigarette in the world.