We don't seem to have even made it through the crust to the mantle (after which ~2'900km to the core) yet: https://en.wikipedia.org/wiki/Mohorovičić_discontinui

We don't seem to have even made it through the crust to the mantle (after which ~2'900km to the core) yet: https://en.wikipedia.org/wiki/Mohorovičić_discontinuity#Exploration https://en.wikipedia.org/wiki/Mohorovičić_discontinuity#Expl...