As part of the first cooperation agreement, the first attempt at cooperation after the short but bloody Yautja war, the first joint archaeological expedition explores the Forerunner city
Professor Belov:
— Astonishing. The city is at least two million years old.
Tha'rak, Yautja, Archaeologist:
— Not the city.
Belov:
— What?
Tha'rak:
— Specifically these walls. They're not the oldest here. And by the way, it says here that this is a hazardous materials warehouse. Best not to go in there.
Belov:
— And the city?
The xenomorph runs a claw across the giant monolith.
Pause.
Kh'raash Kolyvan-Gyrkh-Tara, Sapper:
— No one knows. Longer than we can remember.