Do microwaves - such as with a microwave oven - penetrate the ground if 800 watts set on "high".?

Question

I want to microwave the ground in my backyard - to kill small bugs.

Answer 1

I don't think it has much penetration power. Among Electromagnetic waves, only Infrared can penetrate ground up to a depth of about 6 ft.
Why do you want to kill bugs living below ground ? Not only they are doing you good by making your soil fertile, but they also have as much right to live as you have.

Answer 2

The microwave won't work with the door open and none escape when it's closed.