Hope somenone can Help me... I've been trying to find this movie for a long time.

I saw it when I was young, I think it's an anime (sorry, don't remember too much). Anyway, it's about a girl that likes the sea and water so she often goes diving. One day she lose her mask but instead of dying from lack of air, she discovers that she can breath under the sea and her hair changes color. I think she is from a lost race (something like the Atlantis) and she's always trying to save the sea.

I remember that the story is very much like Nausicaa. Ring any bell?

Thanks! :)

Coral Reef Legend: Elfie of the Blue Sea

Here's the Plot Summary:

In the future, the oceans have risen to flood all the continents due to humanity's negligence of the environment. Only a few bits of land have been spared, and one of those is the city-island where Elfie lives with her grandfather. One day, due to an underwater incident, she discovers that she can breathe underwater. Her grandfather reveals that in truth she is one of the mythical sea-people. Using the cityfolk's xenophobia, local politicians spark a war with this hidden people to distract people from their current ressource problems, and Elfie is caught in the middle of it.

YAY!! Thank you! Thank you so much!

It's a pleasure, I'm an anime addict!