The newer GoPros allow for real time viewing on your phone or tablet via the GoPro app. You can even change the settings and start/stop recording from the app. I've never tried it underwater but I will try to test that shortly and get back to you.
Please do try that, but unless they have figured out how to make radio waves travel under water I'm going to guess it will not work. If it does, it would be at very shallow depths.
They do have under water communications now, so maybe they can do it with a go pro.
