Director's Trademark: The voice-over for the newscasts that crew members watch, detailing the burning forests, etc., is done by director Irwin Allen.
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 Professor Pierre Arronax's assistant Conseil on the Walt Disney version of the Jules Verne classic 20000 Leagues Under the Sea about a 19th century submarine.
Some of the sub's equipment and sound effects were recycled from The Fly.
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.