Team Gamma moved its investigation to the small farm outside of Hive Sibellius. There they interrogated the farm owners and found that a small irrigation station that pumped water up from an aquifer deep beneath the surface was registering a contamination in its filters. Managing to locate maps showing where the river that fed the aquifer met the surface, Team Gamma headed into the hillside to the north of the farm and to an old cave system that was once a mine.
On their journey up the steeply winding track, Trooper Quint incapacitated the vehicle to stop it being used by the enemies of the Empire and allowed the team to proceed on foot. They found the cave was being guarded by several mutants and an almighty fire fight took place. Laz fire and solid slugs filled the rocky chambers as a half dozen horrific mutants returned fire on the heroic acolytes. Even one hulking mutant, obviously the creation of some bizarre twist of fate, could not stand against the sheer firepower of the team.
Once the mutants were all put down it was found that several drums of a powerful mutagen were present in the cave. Some of this mutagen had been dumped into the water supply and it was this that had caused all the problems for those suffering in the Grind.
However, why the mutants were doing this and where they got the mutagen from was still unclear.