I have found the link from the article very interesting. https://spectrum.ieee.org/energywise/energy/renewables/digging-for-geothermal-energy-with-hypersonic-p

I have found the link from the article very interesting. https://spectrum.ieee.org/energywise/energy/renewables/digging-for-geothermal-energy-with-hypersonic-projectiles https://spectrum.ieee.org/energywise/energy/renewables/diggi... It is basically using ramjet technology (such as in the Lockheed D-21), but it's kind of the inlet shape which moves through air enriched with combustible at hyper-sonic speed, on impact the projectile just vaporizes. edit: the gif animation at the top of the article is very misleading