This is a page from my notes with a nice cutaway view that shows the surface of Celestia. I gave a brief overview of Celestia in this post. Click to see a non-clipped version.
The party has been stumbling their way across, over and under the dark ruined surface of Celestia for six sessions now. In that time they have come across quite a few oddities, a few of which I have scanned in from my campaign notes.
The last two sessions have largely focused on this room (including an epic battle last session [Mutagenic Substance Campaign Session #45!] against a liquid-metal robot centipede golem!):
(Top View, scale is at the bottom: The circular thing in the center is an alien machine of some sort. A dome on top of it opens into what appears to be a controlled singularity, the creation and distruction of a/the universe contained within it somehow for an as yet unknown purpose)
Click to see a non-clipped version:
View of the circular thing in the center of the chamber: This emits intense energy in every possible form that energy can be emitted, apparently broadcasting to numerous receptors around Celestia. Everything in this chamber that is powered (the egg foam, the teleporter pods, the lift, and the "cars") runs on broadcast power emitted by this thing.
The party became aware of this strange chamber, totally incongruous amidst the lowest service levels of an ancient subway line, when Tilandriel (an elf made with my Fantasy Quirks character creation supplement for Mutant Future) gained access to the memories stored inside the Dr. Octopus-like tentacled liquid-metal-harness that had attached itself to him. Intrigued by the alien contents of the chamber as revealed to Tilandriel in a 3-Dimensional scan of the subway line, and by some glowing tablets of energy they had previously found which appeared to be related, the party reversed their stolen subway train and headed back to look for the alien chamber.
The numbered circles in the room are matched pairs of teleporter pods. They function similarly to the teleporter pods in the movie The Fly with Jeff Goldblum (one of my wife's all time hollywood crushes and on her top five to do list).
The door of the pod opens from the center at any touch of at least one pound pressure, and will not shut if anything at all is breaking the plane of the door. If at least 1 oz of matter is inside a pod and nothing is breaking the plane of the door, the door shuts and the pods channel the singularity inside the big machine in the center of the room. The contents of the two pods with the same alphanumerical designation trade places in spacetime, instantly, no matter the intervening distance, with no effect that can be observed by anything thus transported, and the door opens in the new location. If the door on one matched pod is open, the door on its mate will not open until the first door is shut. A glowing iris in the center of the door is an omni-directional camera that broadcasts its feed to a screen inside the pod's mate. In this manner, the area in front of the destination pod can be viewed before teleporting.
The pods crossed out with an "X" and numbered 1-3 lead to the corresponding destinations labelled 1-3 at the bottom. The pods that are all the way blacked out are the mated pairs to the pods labelled 1-3 and are consequently missing from the chamber.
Two pods (bottom left corner) are loaded onto a sort of "car" that is parked on top of a working lift that goes up to the subway line. Three more cars, each capable of loading two more pods, are parked along the wall.
Two pits contain mounds of alien eggs, covered in a solidified foam that resembles a spit-bugs nest. The foam is super-charged and delivers a 5d20 damage shock (save vs. Energy attacks for half damage) to anyone foolish enough to touch it. The eggs contain dead embryos, similar in form to mammals in early development, but obviously of a slightly divergent alien evolutionary history.