Why? I would be interested to know your logic, or the source of your evidence, or even faith there.

It doesn’t follow by conventional science, which isn’t perfect, but the only one we know about.

There is no known productive output from such a thing.

Do we see any kind of life coming from within the Earth?

It isn’t even supported or claimed by any religion I know of.

So why would you believe that, or claim to believe that?

The mathematics describing the solar system supports completely our knowledge that the sun is the single source of all power.

We can choose to support solar, or we can choose to support digging more and more holes in Earth.

Do we really still have any doubts which one is wiser?