The iGills waterproof case is your answer to encase your iPhone if you're ever thinking of taking it along for a dive or even snorkeling session. It's safe enough to dive with to a depth of 130 feet. And it also helps you keep track of when you need to surface.
The clear polycarbonate case turns your phone into an underwater video and still camera with the addition of a built in depth and temperature sensor. Perfect for divers. The iGills has a set of buttons you can use instead of your iPhone's touchscreen and it can be used to operate an accompanying all in one app. It helps divers keep track of their depth, time underwater, nitrox levels for making safe ascents, and alarms to set them off to tell divers the remaining oxygen levels.
The case will cost a cool $330 which is pretty expensive actually. [iGills via iLounge]