So I completed the quest, then i was making my way back to exist the place and there is a door that I just can't open. I keep on activating the chain but nothing is happening, it's the only exit of the dungeon. I went on youtube to check out what I had to do and the guy simply activated the chain and left the dungeon. So far I waited 72 hours, reloaded the save file, restarted my ps3 but nothing works .Also my save file went from 16 mb ( when I started the quest) to 29 mb ( when I finished the quest)