User blog comment:Imhungry4444/WHAT WAS HE THINKING?/@comment-1908942-20101231054157

Well, firstly the Calm Belt is a place is there is almost no wind. If you don't have something like a Paddle ship, which they had only one of, you can't move. Then, there's the huge amounts of Sea Kings which if dozens of ships went by, would attract a large amount. Thirdly, no doubt the Marines also expected it, and seemed to have ships in the harbor of Marineford waiting to sail. Combine all three, maybe there would be a chance, but the casulties would be much too high for Whitebeard.