These bees are laboriously dragging a piece of comb out of the hive.
I surmise that it came from a bigger chunk of new comb which had fallen from its bar
(possibly through the clumsiness of a beginner beekeeper who clings to plausible deniability
regarding the incident).
The piece was about as wide as a nickel and as light as a feather.
The chore took around twenty minutes, but I did not stay for the entire, slow-motion show.
I returned later and found the comb discarded in subjacent clover.