The 508

-A permanent encampment of the Chosen 508 descendants of the 508th Light Infantry Regiment of the Imperial Guard, deep with the Lava Tube networks below Asterion

-Has developed into a self-sustaining colony that continues to hold a line against Xenos organisms that appear linked to the Cinquefoil presence on the planet

-Locations within the settlement include the Command Lodge, the Enge (which contains a Reactor), the Omry (Resource Storage and Repair), a Mess, and a Chapel. Appears to have three entrances; Westgate, Eastbraid, and the North Junction. 

-Presence of Xenos organisms indicates that a source may be found near the 508's position; merits further investigation.