No, fairies, elves, leprechauns, trolls, and other magical creatures roam the depths of the earth. Go read Artemis Fowl!
Since my laptop died I haven't been able to look up stuff like I used to, But I've seen and read alittle bit about the hollow earth theory. I'm not to sure that aliens or other types of life forms live inside the earth. In my mind if they have the ability and technology to live inside the earth, they could take over at anytime. Why live inside the earth when you could have the whole planet to yourself? But speaking of Alien life and inside the earth for those who like knowledge check out Lake Vostok at the South Pole. http://en.wikipedia.org/wiki/Lake_Vostok It's the largest fresh water lake known in the world and it's under hundreds of feet of ice. That water hasn't been touched by sunlight in about 14,000 yrs. Could be alot of cool stuff to discovery if we can ever get down there.