I went down to the swamp in Northern Crater to train where the Magic Pots are and then got back out fine. I dropped the save crystal where all the characters convene for the first time and saved. After doing some stuff back up on the surface, I went back down again to train and all the characters were convened in the same spot but I couldn't talk to any of them and I could like, walk through them. I went to the swamp and trained and they were still there when I went back, but this time I couldn't climb up the pole (whatever it is) to get back up and out of the crater. I can't save at the save point either for some reason. I trained for like 3 hours in the cave and gained like 20 levels, mastered a bunch of materia, gained limit breaks, and my game is running right now because I don't want to turn it off without saving. I've also tried going all the way down to the "point of no return" where you jump into the center of the planet. All the characters were there and I got items from them and went back up and I STILL can't climp up the pole in the original area. WHAT CAN I DO????