One thing I’ve learned here is how important listening is.
You hear a zombie through the wall? Pay attention to how loud it’s getting. If you knock down that wall there’s a good chance you’re getting a face full of zombie on the other side.
Earlier I dug through a wall and discovered two skeletons, two exploding giraffe-corgis, a zombie in gold armor, and a twenty-foot pit (containing all of the above denizens) that lead to the door to a chamber I’d dug two floors down from where I was currently excavating.
If I had paid attention to the growling sounds, perhaps I may not have fallen into the pit, though. Which would’ve been better.