This movie has the issue of consistently bringing up several themes it could build on, or relate to, or any single thing it could say, and then purposely ignoring all of that to just be a spooky-ish film about a house that's underwater. Why make the main couple so tumultuous just to never really bring it up again once the ghosts start showing up. Why's this entire ghost family have an underwater house? What's with the dead bird wrapped in like barbed wire on the door gate of the underwater house? What are any of these random symbols that you've given us mean in relation to one another? None of it adds up well together, really.
3/10