How do you kill underground bees?

By spraying a pesticide which you can buy at Lowe's Hardware or Home Depot. Bees are very important for pollination and I saw a program that the U.S. and Canada are experiencing a severe drop in bees and Beekeepers are finding dead bees in their hives. This is more serious than society can ever imagine. Phone a Beekeeper and have them take the problem away.