Hey guys. So I've been working on my world on and off since approximately October. I've created things such as Edgar's Hole, Big Me, The Ridge, The Western Air Temples, and Cruise Ship. However, my biggest and most important structure is The Prison. It is loosely modeled after The Prison from The Walking Dead. I worked on that prison for about three days and it has been my most elaborate structure. The front area is extremely complex, with a portcullis set up that I was going to complete with a friend. However, I came back a week ago and it was just… gone. The front structure is just a black hole that goes all the way to bedrock. I've checked around the internet, trying to find something to help me. I found things on back-ups, which I've never done, and I'm still completely lost. Is there anybody out there who can help me? Also, chickens and water have come out of this hole. What is this.
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http://imgur.com/0rum0yJ
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http://imgur.com/zNErVmq
^Here is the original look
http://imgur.com/0rum0yJ
^Here are the damages