Hadron Deeps

While the rest of the Ultramarines company that had come to aid in the Hadron Expanse moved on to the Echo Cluster, a small force stayed in the Hadron Deeps to investigate strange energy readings emanating from a nebula close to the main warp lane from the Zadoc subsector. Upon investigating the Ultramarines found an enormous space hulk drifting through the void and immediately investigated.

Unfortunately for the small squad sent onto the hulk as a boarding party, the hulk had become infested with genestealers, and despite a brief firefight every one of the astartes send to board the vessel was mercilessly ripped to shreds by the aliens on board. Stunned and somewhat shamed by these events, the Ultramarines simply marked the area as "perdita" and did not immediately report the Xenos infestation to any other imperial authority. Only time would tell whether this would be an action the Imperium would later have cause to regret.