How Long Have These Been Here? is a intel document in Resistance: Retribution.
Transcript[]
Another self-illuminating crystal. And if I haven't lost my bearings, I'd say it was attached to the same rock formation found the other one. I snapped it off the wall and stashed it with the other crystal. LaSalle will love them. Romans dug these catacombs out thousands of years ago, and the Franks kept digging deeper, yet nobody discovered these crystals. It's no accident I happened to stumble across two of these crystals inside ten minutes of each other. No. These things awakened as I approached, almost as if they were beckoning me to claim them.
-- Journal Entry, 06 September, 1951 -- James Grayson