Due to the imported map, there's large underground areas that are now like space because the blocks in them are missing. The only blocks that aren't missing are: The nyan cats! Maybe they are to strong to be ereased...
I took an image at a drilling hole I had created on the old redcrab server. The mapping bot only saved a couple of nodes around that hole:
![Image](https://dl.dropboxusercontent.com/u/14977331/screenshot_20151015_155658.png)
You can see the cat clearly when you're more that 100 blocks from it! I found 3 nyans in maybe 10 minutes of getting down on the "outside" of the structure with all them close to the border like this one. I don't know if they are everywhere in the "underground space" or just around the recorded areas ... maybe going to check that out another day ;)
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coffee
edit: grabbing ores now has also been pushed to another level