User blog comment:AYET/Mihawk - to the NW and back.../@comment-3279487-20120220143726

"How to get out from the grand line" is still left without unanswered questions by oda... the only way we know is rowing and fighting the Sea Kings through the calm belt (at least from pirates). In fact in chapter 104 ''Nami asked "But if they are escaping from here, they have to go through the calm belt!" Crocus: "That's right, so I don't know if they are still alive or dead."'' About how Mihawk is able to go around with his boat I think it's simply because "it's cool".