How do you get rid of an underground bumble bee nest?

You can pour very soapy hot water down the entrance and scatter mothballs around and in the nest. Then, cover the entrance with dirt and keep the soil moist at all times, like with a hose. when you see no bees (should take about4-5 days), wait a day, then dig up the nest. PS If by some chance bees would come out when you are near... RUN!