Page 1484 - Enders_Game_Full_Book

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Command School was at FleetCom, and the location of FleetCom was a closely guarded secret. The only way you ever found out where it was was to be assigned there, and very few people who had been there ever came back to Earth.
Just before arrival, the kids were briefed. FleetCom was in the wandering asteroid Eros. And as they approached, they realized that it really was *in* the asteroid. Almost nothing showed on the surface except the docking station. They boarded the shuttlebug, which reminded them of schoolbuses, and took the five-minute ride down to the surface. There the shuttlebug slid inside what looked like a cave, A snakelike tube reached out to the bug and enclosed it completely. They got out of the shuttlebug into near-zero gravity, and a strong air current sucked them like a vacuum cleaner up into the bowels of Eros.
Bean knew at once that this place was not shaped by human hands. The tunnels were all too low -- and even then, the ceilings had obviously been raised after the initial construction, since the lower walls were smooth and only the top half-meter showed tool marks. The Buggers made this, probably when they were mounting the Second Invasion. What was once their forward base was now the center of the International Fleet. Bean tried to imagine the battle required to take this place. The Buggers scuttering along the tunnels, the infantry coming in with low-power explosives to burn them out. Flashes of light. And then cleanup, dragging the Formic bodies out of the tunnels and bit by bit converting it into a human space.
This is how we got our secret technologies, thought Bean. The Buggers had gravity-generating machines. We learned how they worked and built our own, installing them in the Battle School and wherever else they were needed. But the I.F. never announced the fact, because it would have frightened people to realize how advanced their technology was.
What else did we learn from them?
Bean noticed how even the children hunched a little to walk through the tunnels. The headroom was at least two meters, and not one of the kids was nearly that tall, but the proportions were all wrong for human comfort, so the roof of the tunnels seemed oppressively low, ready to collapse. It must have been even worse when we first arrived, before the roofs were raised.
Ender would thrive here. He'd hate it, of course, because he was human. But he'd also use the place to help him get inside the minds of the Buggers who built it. Not that you could ever really understand an alien mind. But this place gave you a decent chance to try.
The boys were bunked up in two rooms; Petra had a smaller room to herself. It was even more bare here than Battle School, and they could never escape the coldness of the stone around them. On Earth, stone had always seemed solid. But in space, it seemed downright porous. There were bubble holes all through the stone, and Bean couldn't help feeling that air was leaking out all the time. Air leaking out, and cold leaking in, and perhaps something else, the larvae of the Buggers chewing like earthworms through the solid stone, crawling out of the bubble holes at night when the room was dark, crawling over their foreheads and reading their minds and ...