With the way movies that don't need sequels end up getting sequels, imagine this:
TITANIC II: on the anniversary of the sinking of the Titanic, Old Lady Rose returns to the spot in the North Atlantic, and is shocked that the Titanic has risen from its watery grave, and is now a cyborg, steampunk, ghost ship, bent on revenge. Meanwhile, the passengers who perished are now demons who vow to drag Old Lady Rose down to **** for essentially murdering Jack.
TITANIC II: on the anniversary of the sinking of the Titanic, Old Lady Rose returns to the spot in the North Atlantic, and is shocked that the Titanic has risen from its watery grave, and is now a cyborg, steampunk, ghost ship, bent on revenge. Meanwhile, the passengers who perished are now demons who vow to drag Old Lady Rose down to **** for essentially murdering Jack.