What is the movie about a family living in submarine house under ocean?

You're probably thinking of the 2010 film "The Spy Next Door", starring Jackie Chan. While the family doesn't live *permanently* in the submarine house, it's a key element of the film.

Here's a brief description:

* Plot: A retired spy, Bob Ho (Jackie Chan), is tasked with protecting his neighbor's kids from a dangerous criminal. To keep them safe, Bob hides them in a secret, underwater submarine house he's built in his backyard.

Let me know if you're thinking of a different film!