Something just crawled out of there!!!
Maybe it was the Underminers!
http://4.bp.blogspot.com/-G7RWXffRKB8/T13lwWV7CTI/AAAAAAAADUw/o8EOivInsQo/s1600/underminer.jpg
Or maybe... Mole people!
http://stefanpoag.files.wordpress.com/2010/08/molepeoplemoledude1.jpg?w=300
I was thinking crab people...