The Octomask is exactly what it looks like—a snorkeling mask with a GoPro mount situated mid-forehead. The genius of this head-mounted device, as opposed to hand-held underwater housings, is that it records whatever you're looking at automatically. Plus the GoPro mount is integrated into the mask itself rather than being adhesively affixed as the stock dive mountis. On the other hand, the Octomask is twice the price and won't work with an existing mask but the ability to grapple against the deadly, deadly Jaguar shark make it well worth the cost. More here.