In the begining, Jerry is shown surfing for about 5 seconds. In the last clip of him surfing, you can see a scuba diver just behind his board, probably because he was holding the board steady.
I can see him, and I know that he's a camera man, but out of curiosity, why aren't there underwater shots? (I'm sorry if there are. I haven't seen the movie in awile, and I don't remember seeing any.