A few months back I posted a video created by the team at The Underwater Realm showing how they created waterproof hotlights to be used on their feature film that is currently under production. Their entire movie is planned to take place underwater and the shots will be a combination of real underwater footage and studio work. Anyone who has ever shot anything underwater knows that the deeper you go, the bluer the image becomes. With a little bit of color work you can create a much more pleasing looking image. Fast forward to 4:00 for the goods.