As Charles hovered 500 meters to the right of the huge door, at the dome, he got a clear look at those things.
They were some broken pillars, and from what could be seen above, the Foundation had built an upside-down city on them.
If this upside-down city were still intact, it would definitely be magnificent. Unfortunately, as time had passed, only fragments of walls and ruins remained.
"Hmm?" Charles, noticing something, climbed onto a pillar and closely inspected it; the sharp, precise cuts on it were unusual, not typical of natural erosion.
These kinds of cuts reminded him of former enemies, those huge mantises that hovered around the outskirts of New Territory City.
This upside-down city had not fallen by itself, but had been destroyed by those mantises.
"It seems those mantises probably still have other colonies all over the dome; I hope they don't cause any trouble next time I go up."