In my singleplayer world I spawned outside of a HUGE mountain range. Found a nice little hole that I used as my hideout. Well I decided I would make this place my kind of kingdom area, where I would build it up into something. It already had a door kind of thing outside of my little hole, so I got a pickaxe and started digging in it. It got really black, but I wanted to dig through to the other side.
Well come to find out, while it is super black, I end up getting attacked by something. I die, lose all my stuff in this big black 2 block tunnel. haha
So I find a way to get torches, torch my way through there. BAM Creeper. Kill him, dig a couple more blocks and BAM, I found a dungeon. I was crazy jumpy. Run in there, turn and BAM creepers hitting on me. haha. I found the two storage places and got some stuff.
Love this game so far, and now I don't have to dig a lot of it out. Haven't explored it entirely yet. Just found the twirly creeper and storage chests. Love it so far.