Subselene Tunnels Picture

The subsurface tunnels lying beneath the Overculture arcology complexes on the Moon ([link]). These labyrinthine passages appear to have been melted directly into the lunar matrix by boring machines, or perhaps by engineered burrowing organisms. The surrounding lunar silicate was apparently cauterized by extreme heat, creating reinforced glass walls. (Actually this is a cross-section of an air pocket in a loaf of bread!)

There's actually a contemporary mythological basis for a lot of this lunar craziness (lunacy??), and a surprising number of people believe in it:
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Also, the same thing in grayscale: [link]
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