This happened to us once. I guess the bees managed to chew their way into the eaves and access the attic. Which we don’t use.
Where they proceeded to build a pretty big hive in the floor rafters and joists.
By summer the temp spiked, apparently too high. And the bees had sort of penned in their entrance too much. They chewed their way through the drywall of the ceiling on the second floor of the house. Start flying around, but ended up penned into one of the small bedrooms cause it’s door was closed.
I figured it out when I was walking up the stairs and saw one dead bee. Then two dead bees. Then six dead bees on each step. Took one look at the Wickerman situation in that bedroom and left the house.
I’m deathly allergic to bees.
Had wait on the porch for my brother to come by with plastic sheeting and duct tape to seal the second floor of the house off, and clear any strays. He had to come back with bug bombs cause we couldn’t schedule a professional for almost a month out.
He said the bees were attempting to carry thumb sized chunks of comb through a 12" wide hole in the ceiling, and were flying right into the windows and walls with them. While others chewed at the window frame. Also said most of the bees were already dead from the heat, and the comb was “man sized”.
Volume apparently?
According to my dad, who did most of the cleanup. Cause I had to stay far away (dead bees can still sting). The number of shop vac loads of bees he cleared equated to around 60,000 bees.