Corrupted chunks?

I'm working on a map, but it's kind of a problem when the final boss chunk is corrupt... I don't have a backup of this where this chunk isn't corrupt, and this is a real problem. I tested, if I go into singleplayer, it just doesn't load the chunks, so it's not a problem with the server. Thanks for looking at this!
http://youtu.be/VpLztEnNfj8