So what you're saying, I think, is that the holy grail of diving is within our grasp: the ability to watch u-tube clips while diving in a tropical paradise.
I am not interested in seeing YouTube clips while diving
But you could:
a) stream video from you to your buddy (buddies) - and vice-versa
b) stream video from you to the boat
c) if the boat is properly equipped .... stream video from a diver to the rest of the world
Basically you could have a diver becoming a mobile underwater webcam