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I am really struck by the one with the rectangular part with the circular adjacent room.

What I noticed was the wall of the rectangular part at the tunnel entrance to the circular room curves inside the rectangular room to maintain a constant thickness of Rock between the circular room and the rectangular room. I'm thinking that rock is shielding and they knew they needed a minimum thickness of Rock to shield whatever was going on in the circular room whether it was radiation or whatever. And by curving the wall of the rectangular room next to the circular room the thickness of the rock between the two rooms remains constant. That also means they must have had some kind of interesting door to be shielding between the rooms. Of course they also might have needed the thickness if there were high pressures in the circular room. And that rock structure needed to be strong enough to contain that high pressure. It's just obvious from looking at these rooms and the extreme precision and the glazed walls but they knew something going on that we didn't. They could have also been in placements for some kind of weapon that they wanted to be hidden from above by all the rock similar to the way people build concrete gun placements.

These are in solid granite.