Hi, I was just watching "The Dark Knight Rises" and was reminded of a question I had about the end and Batman's flying the nuke outside Gotham where it exploded over the sea. We know tsunamis and even mega tsunamis can be produced by avalances, rock slides, and whatnot. My question is that if those things can potentially cause a wave several hundred feet high wouldn't a nuclear weapon detonating directly above the surface of the water have a similar if not greater effect? It seems like as the energy radiates outward a significant amount of energy would be directed downward causing a tsunami. So, would Batman's actions have really saved Gotham or would he have saved it from the blast only to have it smashed by the tsunami?