Right after he leaps into the boat and the camera cuts away, you can see the front of the boat bump up against the plexi glass platform positioned just below the surface of the water. Both David Blain and Chris Angel did similar tricks where they walked across swimming pools. Sorry, no "magic" here...not even close actually.
I agree, first of all he is balancing himself as if he were on a tight rope, not only so, he walked in a straight path. Why did not they show the boat crossing the path behind him where he just walked to prove there was no rope under the water surface. did not fool me.