Hi. I remember having watched the ending of an action movie on TV, I’d say the movie should have been released in 2010 max. Let’s say 1980-2010. The movie is set in modern times.
We see the main male character and the female love interest escape a sinking ship or submarine and they get into a small underwater vehicle that can house like 3 people and from it the main character launches a torpedo against the enemy submarine and blows it up and I assume the movie ends after that.
I have not seen this, but the following are in the movie: submarine, ship, submersible, torpedo, explosion, escape
UPDATE:
I managed to find the full movie on the internet and the ending of the movie does not really resemble to what you describe, so this is probably not the right movie. You can watch it here:
Okay, I’m sorry once again, lol, I tried a deeper search, watching a handful of movie endings and I found it, some events differ from what I have described but rewatching the ending, I had the déjà-vu feeling.