bees diging into my yard?

actually they are a type of wasp...called a Cicada Killer Wasp...the female will sting cicadas and drag the paralyzed insects into the hole. She then lays eggs and the larvae hatch and feed on the cicadas. They then pupate and go dormant until next summer and emerge as adult wasps to start the cycle again.

Look up bumble bees as well. They look like a bee but large. They nest in the ground. If that is them there are over 240 species of them. Some are harmless. But some out working in the fields if you disturbed a nest in the ground could kill a mule. So know what you are dealing with in them. Or family Bumbla of bees. These will look like supper bees. Not wasp. Some can go 3 inch's in length as well.

They are likely Yellow Jackets and they are a type of Hornet. Hornets are very aggressive and will swarm people who disturb their nests.

You have a few options to get rid of them, the first and most expensive but safest would be to call an exterminator, it would take them just a few minutes to get rid of them but could cost you a pretty penny.

Your second option would be to go to a hardware store and buy some consumer grade pesticides and spray the nest at night. It is not because they can't fly at night but because like humans, they sleep at night so they are much less likely to be active. Be ready for several dozen of them to fly out of the nest.

Your last option would be to burn the nest. For the pyros out there this would probably the most entertaining way. For this you could take some gasoline and other highly flammable liquid and poor it into the nest and then well throw a match in. Be careful with this one as fire can also injure humans, burn down structures, and you will have to get fairly close to the nest. Once again do this at night when they are the least active so you can get close without getting stung. Be ready to get away from the nest once you throw the match in because of angry insects.

Good Luck and don't get stung.

Or...they are grounding nesting hornets. I had the same thing in two locations on my property. They normally won't sting you unless the nest is disturbed, such as cutting grass. Unfortunately I had to use drastic measures because I have grand children who like to play on the lawn. The only product I found that is effective and can be purchased online is called Delta Dust. Another product which is a little bit stronger is Tempo Dust. It will take about a week but it will destroy the nest.

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EDIT. Spraying the opening with a common wasp & bee spray will only kill the ones it comes in contact with. Pouring gasoline might work (without lighting it) if the nest is directly below the opening (unlikely). The spray I mentioned will not be washed away with water unless it's a steady stream (it repels water). The powder sticks to the insects and will be carried into the nests killing all.

They sound like Yellow Jackets a type of ground living wasp. I just wash them out with a garden hose after dark. They can't fly then. They are a beneficial insect so don't go hog wild killing them just get rid of the nests where you walk etc.

Some kind of ground bee or ground-nesting bumblebee. Not dangerous, but can be annoying.