Scuba diving is fun. Shelling out all that money to get yourself properly geared up to make the most of the water, not so much. While you’ll still have to buy basic equipment like a wetsuit, a scuba tank, and all that, the HotDive Pro allows you to replace some common scuba diving electronics with your good old smartphone instead.

A heavily-waterproofed and richly-featured smartphone case, it turns your messaging, calling, and Instagram machine into scuba diving equipment that can serve as an adequate replacement for a dive computer, an underwater camera, and even a fill light. 
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https://www.coolthings.com/hotdive-pro-smartphone-case-dive-computer-underwater-camera-fill-light/