User blog comment:DancePowderer/World Noble Math/@comment-3060121-20110512194511

Actually just because there are waves doesn't meant it was the surface. It was most likely underwater. If you look at the chapter again the entrance where the world nobles were had waves http://www.mangareader.net/one-piece/624/17. And on http://www.mangareader.net/one-piece/624/10 and http://www.mangareader.net/one-piece/624/11 there are waves even though it's under water