Yes...brown is what the water would be if this happened to me:

Wow. People are saying this is fake. I don't think so. It's done very well if it is fake. As he is at the end of the fence, ready to turn, look down at the water below him. Shark outline. Also, right before he jumps, you can see a dorsal fin at about the 12 0'clock position. Either that, or someone at GoPro has some mad skilz!

KCRO~AS