If you like Red October, dont miss the french movie "Le chant du loup". Absolutely great for lovers of the genre: "The Wolf's Call" - https://www.imdb.com/title/tt7458762/
I had little expectations toward that movie (I think it was just randomly airing on the TV and I watched it), but was very pleasantly surprised.
I'm a fan of Clancy's books (and movies based on them), and The Wolf's Call could easily be one of them.