Alex strapped her backpack to the front of her with the blow torch on top and wedged herself between the large rock wall and the wall below their vent. Jack followed her example and they inched their way down to the bottom floor.

Her right arm ached as she used it to crawl little by little down the framework. When they finally reached the bottom, Jack staggered behind as Alex walked gingerly between the walls. She counted her steps and stopped suddenly. Jack bumped into her. ...