What TV-show from the 90's is this?

I am looking for the name of a tv show (american or maybe australian) where they lived at some kind of platform/working station under the water in the ocean. The kids were either studying humpback whales or something. All i remember is that they liked the whales, and there were some 'evil' guys that wanted to hurt the whales..... I don't remember much else, other that i vaguely remember what the main charachter looked like. He had curly sort of red hair... Does that ring a bell to anyone???