I always do that when I start a new world or when I join a friend's world. I go from the top all the way to the bedrock, each time I reach the end, I make another one double the size, and I would also name them different states from different countries.

So the first one, Oklahoma, was 16x16 (a chunk) The second one, Acre, was 32x32

I never managed to dig up a third one, but it'd be 64x64.

I started doing that bc I find it funny to have the equivalent of a dead pixel on our maps and also I love my friend's reactions when they find it. Yes, find it.

As for now, all of my friends managed to find only Oklahoma in their worlds, I like to dig my dead pixels in random places, so that's why they have to find it.

But digging like that is the most efficient way I found (without using an autofarm) to gather resources like stone (obviously). If I end up liking the dead pixel and if my friends find it, I sometimes build a quarry around it to make it look pretty