Quest - Where no daylight dwells

After finally convincing at least Lt. Col. Higgs to invastigate new Skaarj sightings your squad returns to the very Skaarj Mine, Hector barely got out alive one year ago. Arriving at the site you discover the that original entrance is completely gone and no trace of the mine is left. Hector states that he exactly knows how the entrance looked after he got out and that there MUST be something left since the underground facility was so massive. The squad believes him and together they look for hints to another entrance...