Subterranean Facilities/The Lava Tubes

-The Reliquary (discussed in the Xenotechnological Incident) and the front line defenses of the 508 indicate that the Lava Tube network in Asterion's subterranean reaches is likely to hold additional locations with evidence of Cinquefoil presence.

-The subterranean Null Singularity bears hallmarks of Cinquefoil Construction