What is this game called?

I played it briefly when I was about 10 years old. I still remember it today, but I dont remember the name. It was a sidescroller and I believe you started out on land and you eventually went underwater into some sort of submarine. I dont have many details about the game unfortunately. I do remember reading a Nintendo POWer magazine and the same game was being advertised and it offered a contest that offered a prize to whomever figured out a "secret" in a level first. I know I dont have many details, but this game still intrigues me all these years later and I want to be able to play it again.

Please ask any questions that may help refresh my memory. Thanks