In Otaniemi they drilled to 6.4 km and got 125C rock. https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/437325 https://agu.confex.com/agu/fm18/meetingapp.cgi

In Otaniemi they drilled to 6.4 km and got 125C rock. https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/437325 https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/437325 Current deepest hole is 12 km. Temperature goes up 18 C per km. I think the hole would get quite technical if we tried to go to 70 km deep...