His name is Primo Ravnik and his thing is riding a bike downhill on a 200-foot wall of a dam!
He then crashes straight into the water, submerging himself and the bike. All of this is captured with a waterproof go pro strapped to his helmet so you can take the ride with Ravnik to get an idea of just how insane this must have been. Its hard to tell what the impact was like hitting that water, but it seems pretty damn harsh! Nevertheless no doubt one hell of a thrill as you are about to see!
Original Post: http://damn.com/200-foot-dam/