If you look carefully you can see bees and comb in about the center of this picture. They are just above the yellow insulation and to the left of the 2 holes.  The holes are air holes in the ceiling.  The bees had come in through the vent holes and attached themselves to the bottom of the roof.  The space was hot and tight. John, our partner used a bee vac to get them. He had to be careful not to fall through the ceiling. The alarm pheromone was so strong in that tight space it irritated me and I started coughing.