This is NOT a Shark movie! This is about a couple who try to survive after a tragedy. So they go on vacation instead of dealing with the issue. You don't see a Shark until more than 1/2 way into the movie.
And it's not scary. I still don't know if the ending was real or the person lost their mind! What a waste of 1-1/2 ! Don't waste your time. Re-watch JAWS instead!