The occupant of a disturbed bumble bee nest will buzz in a loud volume. They defend their nests aggressively.
Bumble bees often nest in the ground, but can be found above ground around patio areas or decks. They will sometimes build their ness in soffits of attics.
As part of their aggressive defense of their nests, bumble bees will chase nest invaders for a considerable distance. The bumble bee sting is one of the most painful. Unlike honey bees, bumble bees can sting more than once.