The rousing musical score really did a lot to keep the film from being a total stinker.A preferred the novel to the movie because at the very least, some of the ideas for raising the ship....had the hull been intact and in a reasonably good state of preservation.....were at least theoretically plausible.
The movie was horrible but the musical score at least was great.
Parts of the film are actually done quite well but it oddly deviates from some key elements of the novel. For example, Captain Prevlov is a far more prominent character in the book He's a young, ambitious Soviet intelligence officer who leads a boarding party to take over the Titanic. But in the film he's barely more than a minor character and is played a short, balding middle age actor. In the film there's no boarding party, no big showdown between Dirk Pitt and Prevlov.