“Seen from outside, people standing in the center of the deepest crater look like tiny ants. On photos you might believe that these are smaller, basketball-field size areas. Actually, the Moray Terraces resemble more with gigantic mines.”
I wonder if the small black figure in the lighter section just outside the circular crater section near the center of the pic is a human? That would give us some size comparison.
The idea that this is a giant bio-science lab seems a little far-fetched. How much effort to build this, working without machining tools?
I see three specks and by golly I think they are people. Wow, that gives some perspective on how enormous these structures are.