Yeah, I should try the movie mode underwater, with the pumps running, and close up to some corals, to see how it looks.
I did try the movie mode in my plane, in the cockpit, a few days ago. However, was disappointed, because again the AF would often focus on the windshield putting the scenery out of focus. My old Sony at least had a manual focus, so I could set it far out, and it did pretty well. This is not a big concern for me, though, as I am waiting to get a new POV camera for my plane. Most of the good summer float flying is done now for the year, so have until next spring to find a good one. Maybe by then the Gopro 4 will be out with GPS...
Getting a little off topic, but here is a youtube using my old Sony from a few weeks ago going into a local alpine lake.
http://www.youtube.com/watch?v=K9o5Ytfr-g0