I love scuba diving, and nothing is more enjoyable than discovering life and/or things in 60 to 120 feet of water. And I really love finding and trying out new scuba gear, especially gear that can be operated with one hand, (since that's all I've got). So it should come as no surprise that when I discovered this new phone app and dive case, the 'iGills SE-35', I started foaming at the mouth. I've got to get my hand on one of these. My iPhone can now be part of my scuba gear. What all does it do and how much is it going to cost me?