Hi this is an old movie and I can't remember the name... Its about when the entire world is underwater people are living on floating colonies... The hero has gills behind his ears.. When the colony is attacked the hero, heroine and a child escape in order to find dry land.. Which they do..

Can you please tell me the name of the movie?

Waterworld (http://www.imdb.com/title/tt0114898/)

As I remembered it was Waterworld casted by Kevin Cosner.

Sin bag jason and the acqvauts

The movie is indeed waterworld... thanks guys...