Boom, boom, boom, boom— AllSpark storage area, observation deck embedded in the rock wall. The faintly yellow lights flickered as a dull rumbling vibration traveled up from the ground. Harold craned his neck, instinctively pressing a hand against the M9 pistol at his waist as his eyes swept across the ceiling of the observation deck. Dust and sand shook loose from the cracks. Beneath this place lay concrete covering an area four football fields wide. Even so, the force from the surface still made the ground beneath their feet tremble.