Umm if you meant if you can leave the Cleft of Deminsions, then yes you can. You just have to go all the way back through again though. But the mime class is under the water. I'm not sure fully where but it's under the water, so you need the sub to get it and it's in a tower. You have to get to the bottom of the tower and fight GoGo and win, which is very difficult. To beat GoGo (SPOILER)sit there and do nothing, he'll go away eventually.