A lot of Kickstarter projects are launched with little more than an idea and a mockup, but the tentatively named FourPro iPhone underwater housing was field tested while filming great white sharks. So I think it's already proven itself.
Rated to survive depths up to 100 feet in saltwater, the Mocean Armor rig uses the same materials as professional submersible camera systems. The housing and cross bar are made from marine grade billet aluminum, teak wood handles, with pressure enhanced rubber seals ensuring your phone never sees a drop of liquid. The iPhone's display remains completely visible when inside, and while you can't operate the touch screen, recording is controlled via a sealed mechanical button that presses on the volume up control.
A donation of $400 secures one of the underwater housings for yourself once they go into production, which also includes a carrying case. And if you don't get in on the ground floor, the actual MSRP is $700. Now I know trusting any contraption to protect your device underwater is a sketchy prospect, but if it's good enough for a National Geographic videographer, I'm inclined to believe it's more that suitable for filming my antics in the pool. [Kickstarter via Gizmag]