Illustration Friday: Subterranean

Originally, I wanted to draw a massive robot in the centre of the earth, hooked up to powerlines running down from the cities. It was too difficult and certainly not something i could churn out in a week.
I thought about what surprising or strange things one might find if one dug deep enough, and variously tried
robots, giant newspaper-reading bunnies, another smaller planet earth, and an upside-down version of the city on the surface.
Inspiration failing and frustration mounting, I went and bought a shovel and started digging in my back
garden. When i finally got there, it turned out that what was lying in wait was the enormous skeletons of
dead lava monsters. Kind of obvious, really.
So that's what I drew.