According to legendary SFX technician L.B. Abbott, this film used some out-take footage of the model of the S.S. Queen Mary used in The Poseidon Adventure (1972). In this TV-movie the scene is where the ship is listing to one side and then begins to right itself. This was actually a rejected special effects scene because the miniature wave that was supposed to capsize the model in "Poseidon" was too small and had to be re-shot. Luckily that 'bad footage' was saved and came in handy for this TV-movie. Also, every scene of the ship at sea was footage from "Poseidon Adventure" (mostly establishing shots) since the original model of the Queen Mary was no longer available for filming.
Irwin Allen wanted to develop a television series based on this movie, but CBS turned down the offer.
This TV-movie was filmed by Irwin Allen's second unit team in the fall of 1974, while his first unit team was busy with post-production chores on getting The Towering Inferno (1974) ready for its Christmas 1974 release date.
David Hedison and Burr DeBenning did some of their own underwater stunts. They both performed similar work in previous [Irwin Allen ] productions: Hedison in Voyage to the Bottom of the Sea (1964) and De Benning in City Beneath the Sea (1971).