Story loses cred at outset: Marianas Trench/Atlantic
Rarely do I nitpick animation or sci-fi or what have you for the details. But this movie starts with a pretty big one:
Marianas trench is in the Western Pacific Ocean. As we know, it's deep - like 30,000+ feet deep. The captain of the submarine says, "investigating an SOS beacon in the middle of the Atlantic." The initial blurb says they are in the Marianas...this doesn't speak to quality of line editing.
And since Atlantis is the subject..let's not try to introduced the story out in the Pacific.
That's all.