Why are there giant concrete tunnels in the desert?

I have something I think you need to see. This is an experiment done with a regular plasma ball, being spun at 2000 RPM'S. It creates its OWN magnetic field. You can see the definitive north and south pole, as well as tropics and an equator. Now this is being created by regular gasses inside a plasma ball you buy off a shelf. It's VERY plausible, that at our earth's core, the different metals of our core being compressed by our lower mantle creating heat, combined with the rotation of earth at 65,000 MPH creating even more heat, would turn our solid core, into a molten liquid core. The faster the Earth spins, WELL past 2000 RPM's would further transform it into a super plasma state. The FASTER it spins, and instead of basic gasses like in a plasma ball, and having metal properties instead, would still create magnetic fields, but COULD actually also create gravity. 
Here is the link. It starts at the 5 minute mark. Mind you, this is just basic instruments using a battery, and a motor. Using proper equipment and liquid metals, you could theoretically not only create gravity, but reverse it. Meaning instead of gravity pulling, you could create a field that could PUSH it, using it for interstellar travel. The sun would charge these devices, the same exact way our Earth's plasma core gets its sustainable charged energy from the sun, at the poles. Our government already knows this, but implementing this technology into vehicles, would eliminate the need for fossil fuels, in which they get rich from. 
https://youtu.be/i1J5HF1yUAw