This is an area I've somewhat been working with lately. The best way to see what's going on down there is a hardwire to a monitor. Going wireless is frustrating: 2.4ghz and 900mhz broadcast power needed to penetrate water is very high (similar to the way a microwave oven works!), otherwise, you need to keep the antenna tip above the surface. Resolution, bandwidth etc, will also play a part.... Lower frequencies which will penetrate water readily are challenging to design/develop/implement with video/sound/data. Scott Thatcher (the "S" in H&S Video Periscopes) has very much 'been there and done that,' and imparted to me what little technical info I'm privy to. Cramming all of this into the confines of a functional R/C sub, another challenge. Tethering your transmitter antenna to a towed buoy does work successfully.
Any diver might then note that water clarity will be critical to seeing anything, no matter what the lux rating and resolution of your camera and or illumination via lighting. For pools it'll be a hoot, most ponds and lakes it'll likely look like mud.
Is it possible? #### yeah! Do it, figure out how to make it work, push the modeling/technical envelope. If it was easy, everybody'd have one....
I wish you much luck and perseverance
SC member #1848
What part of "Bonds skin instantly" DON'T you understand??