Gyrotrons drill deep into earth by melting rock with energy beams; could revolutionize geothermal power extraction

https://www.hydrogenfuelnews.com/geothermal-power-gyrotrons/8564288/

"using same amount of energy required to power typical drilling rig... millimeter-wave source targeted through 20 cm waveguide blasts basketball-size hole into rock at 20m/ hour... continuous drilling for just over 25 days at that rate would create the deepest hole in the world... drilling for geothermal energy would be the fastest and cheapest"